101 specialized prompt libraries, interactive tools, and comparison guides — organized by use case so you find what you need in under a minute. Copy into Claude, ChatGPT, or any AI and go.

Blog posts, copywriting, email sequences, newsletter content, and content strategy. Every written form organized and ready to copy.
Resume optimization, cover letters, LinkedIn profile, interview prep, and salary negotiation. Land the job or the promotion.
Video scripts, clickable titles, thumbnail concepts, YouTube Shorts, channel growth strategies, and monetization. Built for creators.
Midjourney, DALL-E 3, and Adobe Firefly prompts for YouTube thumbnails, food photography, social media graphics, portraits, and product shots.
Project proposals, client emails, scope of work documents, rate increase announcements, portfolio case studies, and service page copy.
Daily planning, deep work, meetings, delegation, weekly reviews, and getting out of overwhelm. Work smarter with 300+ structured productivity prompts.
Essays, research papers, studying, presentations, math & science, and grad school applications. Every academic prompt a student actually needs.
Enter your target role, experience, and achievements. Get a complete personalized set of AI prompts to write every section of your resume — summary, bullets, skills, ATS, and tailoring.
Enter your target role, company, and experiences. Get personalized behavioral questions, technical prep, company research, weakness answers, questions to ask, and salary negotiation scripts.
Ad copy, landing pages, email campaigns, content marketing, growth strategy, and sales copy — built for marketers, founders, and growth teams who need results.
Which AI is actually best for each task? Honest comparison of Claude, ChatGPT, Gemini, Perplexity, and Copilot — by use case, free tier, and specific workflow.
Enter your topic and tone. Get platform-specific prompts for Twitter threads, LinkedIn posts, Instagram captions, Reels scripts, and Facebook. Instant, tailored output.
Enter your title, target role, and achievements. Get personalized prompts for your headline, About section, experience bullets, keyword optimization, and connection outreach — all tailored to you.
Enter your business details and get AI prompts for every section — executive summary, market analysis, financial projections, operations plan, risk analysis, and investor pitch one-liner.
Enter your niche, audience, and platforms. Get a full 30-day content calendar with topic ideas, hooks, formats, and repurposing system — tailored to Instagram, YouTube, LinkedIn, TikTok, blog, and more.
Enter the job details and your achievements. Get personalized cover letter prompts — full letter, email body version, 3 opening hooks, follow-up email, LinkedIn message, and career change framing.
Enter your startup details and get AI prompts for every slide — problem, solution, market size, traction, business model, team, financials, and the ask. Built around VC evaluation frameworks.
Enter your topic, channel style, and audience. Get a complete video script — scroll-stopping hook, full word-for-word script, B-roll notes, pattern interrupts, 5 title options, thumbnail concepts, and CTA.
Enter your offer, audience, and proof. Get AI prompts for every section of your sales page — headline, hero, problem, benefits, social proof, objection handlers, pricing, FAQ, guarantee, and CTA variants. Built on direct-response principles.
Enter your offer and audience. Get complete ad copy for Facebook, Instagram, Google Search, LinkedIn, TikTok, and YouTube pre-roll — hooks, headlines, body copy, and a 20-CTA bank. Built for direct response.
Enter your niche, audience, and topic. Get AI prompts for subject lines, opening hooks, story sections, value content, CTAs, sponsor blocks, welcome sequences, and re-engagement emails. Built for newsletter creators and content marketers.
Enter your situation — salary, freelance rate, contract, or vendor deal. Get word-for-word scripts for your opening, counter-offers, objection responses, closing moves, and follow-up email. Built on proven negotiation psychology.
Enter your expertise and audience. Get AI prompts for course title and positioning, full curriculum outline, lesson structure, learning outcomes, sales page copy, launch email sequence, pre-launch validation, and platform setup guide.
Enter your topic, key points, and audience. Get AI prompts for 10 hook variations, a complete Twitter/X thread, engagement tactics, thread variations, LinkedIn repurposing, and a full content repurposing system across 7 platforms.
Enter your role, achievements, and personality. Get AI prompts for LinkedIn About section, speaker bio, short bios in 3 lengths, Twitter/X bio, website About page, press bio, podcast guest intro, and email signature. Every format covered.
Enter the project, client, and your approach. Get AI prompts for a complete winning proposal — executive summary, scope of work, 3-tier pricing, project timeline, case studies, objection handling, follow-up sequence, and contract terms.
Enter your product, audience, and sequence goal. Get AI prompts for every email — full scripts, subject line banks, send schedule, segmentation forks, A/B test variants, and a metrics framework. For welcome series, sales drips, launches, and re-engagement.
Enter your brand, audience, and personality. Get AI prompts for a complete brand voice guide — voice attributes, tone spectrum, vocabulary bank, do/don't copy examples, platform adaptations, brand persona, grammar rules, and a consistency test.
Enter your customer, their challenge, and the results. Get AI prompts for a full case study — headline, narrative arc, customer quotes, repurposed versions (email, LinkedIn, Twitter, deck slide), customer interview guide, SEO meta, and sales materials.
Enter your offer, audience, and transformation story. Get AI prompts for a complete Video Sales Letter script — attention hook, problem agitation, credibility story, social proof, offer reveal, value stack, objection handling, close, and traffic emails to drive viewers to the page.
Enter your process, team, and tools. Get AI prompts for a complete Standard Operating Procedure — step-by-step guide, QA checklist, RACI roles matrix, decision tree, troubleshooting guide, and new employee training version. For operations leads, founders, and anyone scaling a team.
Enter your offer, launch window, and pre-launch angle. Get AI prompts for every piece of your launch — pre-launch content scripts, full email sequence, cart open and close copy, social media calendar, live event script, and post-close waitlist nurture. Built on the open-cart launch model.
Enter your expertise, audience, and contrarian point of view. Get AI prompts for a complete thought leadership system — POV positioning statement, content pillars, 8 signature LinkedIn post formats, long-form article, 30-day content calendar, and LinkedIn profile optimization. For founders, executives, and consultants building an audience.
Enter your niche, audience, and offer. Get AI prompts for a complete quiz lead magnet — quiz concept and title options, all questions and answer choices, result type pages for each segment, segmented email welcome sequences, and opt-in and promotion copy. Works with Interact, Typeform, Outgrow, and any quiz platform.
Enter your platform, niche, audience, and metrics. Get AI prompts for your complete brand partnership toolkit — 3 cold pitch email formats, media kit copy, rate card and packages, 4-touch follow-up sequence, negotiation scripts for lowball offers, and UGC and affiliate pitch templates. For creators at any size.
Enter product, customer profile, key result, before state, format, and placement. Generate a complete social proof pack: 10 testimonial variations across 5 categories (result-first, before/after, objection-crusher, ultra-specific, emotional), a full B2B case study with sidebar data box, 6 review request email and SMS templates, social proof assets for every funnel stage (TOFU/MOFU/BOFU), video testimonial scripts with director's notes and filming questions, and a full testimonial collection and display strategy playbook.
Enter topic, audience, core promise, webinar type, duration, offer, and 3 key teaching points. Generate a complete webinar package: full slide-by-slide word-for-word script with engagement cues, 5 opening hooks and 8 pattern-interrupt scripts for retention, 8-email promotion sequence (registration through replay close), 3-audience post-webinar follow-up sequences, registration page copy with 5 headline options and FAQ, and a 30-piece content repurposing plan. Covers educational, live sales, demo, panel, and challenge formats.
Enter employee, review type, performance level, accomplishments, development areas, and next-period goals. Generate a complete review package: full annual/mid-year review with competency ratings, 5 self-assessment versions (achievement-forward, growth-narrative, impact-focused, honest-balanced, promotion case), 6 difficult conversation scripts (below-expectations, PIP, denied promotion, star employee retention, peer feedback delivery), 10 peer feedback templates for different relationship types, a complete PIP with 30/60/90-day milestones, and a promotion case builder with evidence matrix, objection handlers, and announcement draft.
Enter role title, company, responsibilities, requirements, seniority, work arrangement, and compensation. Generate a complete hiring package: full AP-style JD with must-haves vs. nice-to-haves, 5 attract-filter rewrites (results-first, problem-first, culture-forward, ultra-concise, executive tone), 30 screening and interview questions across 6 categories, inclusive language audit with rewrites, multi-platform adaptations for LinkedIn, Indeed, careers page, and referral brief, and verbal/written offer scripts with rejection templates. Includes compensation framing and candidate reference check questions.
Enter your company, announcement, type, target media, key facts, and spokesperson. Generate a complete PR package: full AP-style press release with 3 headline options, 25-option headline lab, 5 pitch emails tailored to journalist type, 20-quote executive bank across 5 categories, 6 crisis statement templates with internal messaging, and a complete distribution and amplification strategy. Covers product launches, funding rounds, partnerships, awards, executive hires, milestones, and crisis communications.
Enter your offer, prospect, value prop, outreach type, sequence length, and tone. Generate a complete cold email campaign: full multi-touch sequence, 30 subject lines across 6 categories, personalization frameworks with research sources, vertical-specific sequences for 3 prospect types, a 7-touch LinkedIn outreach sequence, and reply-handling scripts for 8 scenarios including objections and breakup emails. For B2B sales, partnerships, recruiting, PR, investor outreach, and freelance pitching.
Enter your brand, audience, goals, platforms, voice, and posting frequency. Generate a complete 30-day content calendar with daily posts, 5 platform-specific captions per platform, a content pillar system with 12 monthly themes, 50 viral opening hooks by category, a full hashtag and SEO strategy per platform, and a 90-day growth plan with analytics framework. For creators, brands, and social media managers across any niche.
Enter your newsletter name, subscriber type, this issue's topic, format, voice, and monetization model. Generate a complete publish-ready issue with 5 subject lines, 30 subject line variations, a reusable template system with content calendar and welcome sequence, a 0-to-10K growth strategy, sponsorship and paid tier copy, and a repurposing system turning one issue into 10 pieces of content. For solo creator newsletters to brand publications.
Enter your personality, interests, what you're looking for, platform, vibe, and one unique detail. Generate a complete profile (bio + platform-specific prompts), 5 bio variations in different styles, 20 Hinge prompt answers, 15 first-message openers by category, a full profile audit and rewrite with honest feedback, and a premium app version for The League or Raya. For anyone who wants a profile that sounds like them — not like everyone else.
Enter your topic, target reader, core promise, purpose, niche, writing style, and length. Generate a complete table of contents with chapter summaries, a full ready-to-use introduction, a chapter writer prompt for any chapter on demand, a condensed lead magnet version with opt-in page copy, a sales page for selling the ebook, and a 5-email launch sequence. From free lead magnets to premium paid guides across any niche.
Enter your company, description, market, stage, business model, traction, and moat. Generate a complete 10-slide investor pitch deck (problem, solution, market size, business model, traction, GTM, competition, team, ask), a single-page investor one-pager, a 4-email cold outreach sequence, 20 due diligence Q&As, a YC-style accelerator application, and a 3-minute verbal pitch narrative. For pre-seed through Series A founders and accelerator applicants.
Enter your product, user flow, brand voice, copy type, and product category. Generate a complete UI copy system including screen headlines, button labels, placeholder and helper text, a full error message library (8 error types), 6 empty state variants, complete onboarding sequence with emails, a notification and alert system, and a voice & tone guide with word choice rules and accessibility notes. For product designers, UX writers, and founders building their design system.
Enter your product, value prop, target customer, CTA, page goal, product type, and tone. Generate a full section-by-section landing page (hero, problem, solution, how it works, social proof, pricing, FAQ, closing CTA), 10 headline A/B variants across proven frameworks, objection-crushing FAQ + guarantee copy, 5 above-the-fold test variants, a mobile-optimized short-form version for paid social, and a complete CRO audit checklist. For SaaS, courses, DTC, agencies, and coaches.
Enter your email topic, brand, subscriber segment, goal, voice, and industry. Generate 50 subject lines across 10 psychological types, 30 paired preview texts, a structured A/B testing framework with 10 test pairs, 40 re-engagement win-back lines, a full seasonal calendar with 75+ subject lines, and a subject line audit with spam trigger lists, segmentation strategy, and mobile optimization checklist. For email marketers, newsletter writers, and DTC brands.
Enter your property details, features, and target buyer. Get AI prompts for MLS descriptions (short and full versions), Instagram/Facebook/Twitter social packs with Stories sequences, 3-email listing campaigns, open house scripts with discovery questions and follow-up texts, buyer-facing neighborhood guides, and luxury listing copy. For agents, brokers, and property managers.
Enter your affiliate product, platform, and niche. Get AI prompts for full review articles with FTC disclosures, vs. comparison posts, 7–10 product roundups, 5-email affiliate sequences, social media packs (10 tweets, 5 IG captions, 10 TikTok hooks), and a 90-day monetization strategy with revenue projections and link placement guidance. For bloggers, YouTubers, and niche site builders.
Enter your product, features, and target customer. Get AI prompts for full long-form product descriptions, complete Amazon listing packs (title, 5 bullets, A+ content, backend keywords), 10-set bullet point variations, 20 A/B headline variants, category page copy, and a 4-email + 3-SMS product launch sequence. For Shopify, Amazon, Etsy, and DTC brands.
Enter your keyword, audience, and domain authority. Get AI prompts for full publication-ready SEO articles, keyword research and topic cluster maps, content briefs, 50-page meta data packs, internal link strategies with anchor text variants, and schema markup with technical SEO checklists. Built for E-E-A-T and featured snippet targeting.
Enter your topic, platform, and audience. Get AI prompts for your complete video production pack — full scripts with B-roll cues, 10 hook variations, shot lists with visual direction, YouTube SEO titles and descriptions, short-form repurposing clips and captions, Twitter threads, LinkedIn posts, and 15/30/60-second ad scripts. For YouTube, TikTok, Reels, and courses.
Enter your product, buyer persona, and objections. Get AI prompts for your full sales playbook — cold call scripts, 5-email cadences, LinkedIn 7-touch sequences, SPIN discovery talk tracks, objection handler packs, closing sequences, and post-demo follow-ups. Supports consultative, challenger, MEDDIC, and storytelling methodologies.
Enter your show name, niche, episode topic, key points, target listener, and format (solo, interview, co-host, or narrative). Generate a complete episode content package: full episode script or outline with cold open, structured sections, and outro; interview question packs with 30 questions across warm-up, backstory, core topic, tactical, and rapid-fire categories; SEO-optimized show notes with timestamps and resource sections; 10 episode title options across five proven categories; promotional clips and social copy for Instagram, TikTok, Twitter threads, and LinkedIn; and standalone intro/outro scripts for branded openers and per-episode hooks. Covers episode lengths from 10-minute quick hits to 90-minute longform conversations.
Enter your business, customer, current channels, budget, and growth goal. Generate a full marketing engine: 12-month strategy audit and roadmap, ICP and positioning framework with competitive map, content marketing system with repurposing engine, paid acquisition plan with unit economics targets, retention and referral system, and a week-by-week 90-day sprint plan. For founders, CMOs, and marketing teams connecting strategy to revenue.
Enter your business, revenue model, and churn rate. Generate a complete retention engine: cohort analysis and churn diagnostic framework, behavioral churn prediction signals with health score system, onboarding and activation audit with time-to-value analysis, win-back email sequence (all 6 emails written), loyalty and NPS action system with expansion revenue playbook, and a week-by-week 90-day retention sprint. For SaaS founders, customer success teams, and subscription businesses fighting churn.
Enter your offer, audience, and copy goal. Generate complete copy in 10 frameworks side by side (PAS, AIDA, BAB, FAB, StoryBrand, 4Ps, PASTOR, QUEST, open loop, social proof-led), 40 headlines across 8 styles with best-pick recommendation, voice of customer research system with 20 interview questions, full long-form sales page template across 12 sections, 5-email launch sequence, and a 20-point copy audit with specific rewrites. For landing pages, ads, emails, and sales pages.
Enter your startup idea, the problem it solves, target customer, and founder background. Generate a complete validation package: full 6-dimension idea audit with kill/pivot/build verdict, bottom-up market sizing with $100M revenue path analysis, customer discovery interview system with 20 questions and signal framework, 30-day validation sprint with weekly goals and go/no-go criteria, investor readiness assessment, and first-100-customers go-to-market across 5 channels. For first-time and repeat founders.
Enter your product, current price, customer profile, and business model. Generate a complete pricing strategy package: full model audit across 6 pricing frameworks with recommendation, 3-tier architecture design with naming systems, price increase playbook with 3 email templates, willingness-to-pay research system (Van Westendorp, Gabor-Granger, smoke test), freemium vs. free trial design guide, and competitive pricing response scenarios. For SaaS, services, e-commerce, and marketplace businesses.
Enter your product, audience, brand personality, and naming style preference. Generate 50 name candidates across 5 strategies (real word, coined, compound, metaphor, founder-culture), a deep 8-dimension evaluation of your top 5 finalists, 30 tagline options across 6 approaches, a complete brand architecture and naming system, domain and social handle acquisition strategy, and a 10-scenario stress test. Built for founders, product teams, and brand strategists.
Enter your current role, target position, achievements, and keywords. Generate a complete resume package: full resume rewrite across every section, ATS keyword analysis with placement strategy, 50 power bullets across 5 impact categories, career change reframing system with transferable skills audit, 10 professional summary variants, and an executive resume with board-ready leadership narrative. Works for any industry, level, or career stage — entry level through C-suite.
Enter your role, career goal, top achievements, and target keywords. Generate a complete LinkedIn profile package: complete profile rewrite across all sections, 5 About section versions (story-led, results-led, keyword-optimized, problem/solution, minimal), experience bullets for 3 roles using power verbs and quantified outcomes, 20 headline variants across 5 strategies, connection request and outreach message templates, and a 30-day content strategy with 5 full post drafts. Optimized for job search, client attraction, thought leadership, or career pivots.
Enter organization, project, funder, grant type, impact goals, and budget. Generate a complete grant package: full project narrative with all 6 sections, 3-page Letter of Inquiry with follow-up templates, line-item budget narrative with cost-effectiveness analysis, logic model and evaluation plan with SMART outcomes and data collection methods, funder alignment strategy with 90-day relationship-building plan, and a scoring rubric audit with specific language improvements. Covers nonprofits, academic research, arts, small business, government, and fellowship applications.
Enter your product, user type, aha moment, and biggest activation barrier. Choose trial length and tone. Generate a complete SaaS lifecycle email system: 6-email welcome and activation sequence, trial expiry and upgrade conversion sequence, feature adoption emails by segment, churn risk check-ins and 90-day win-back campaign, in-app tooltip and modal scripts, and NPS survey emails with detractor/promoter follow-up templates. Includes timing strategy, segmentation logic, and churn signal monitoring framework. For SaaS founders, growth teams, and product-led growth builders.
Enter your brand name, industry, audience, and mission. Define your tone personality with 10 attribute toggles. Generate a complete brand voice guide: 4-attribute voice framework with meaning and examples, comprehensive do/don't writing rules across grammar, word choice, and tone, before/after copy rewrites for email, CTA, error pages, and pricing, a master AI training prompt to make Claude or ChatGPT write in your voice instantly, platform tone adaptations for LinkedIn/Twitter/Instagram/email/website, and a brand vocabulary list with banned words. For founders, content teams, and agencies building consistent brand identity.
Enter your course topic, audience, and promise. Generate a complete course package: full module map with lesson breakdowns and exercises, lesson script templates (full script + talking points + slide deck), long-form sales page copy with all 11 sections, pricing and positioning strategy with revenue scenarios, a 7-email launch sequence, and student onboarding emails. Includes a community setup checklist and testimonial request templates. For coaches, consultants, and creators launching on Teachable, Kajabi, Skool, or Gumroad.
Enter your name, niche, topic, and CTA goal. Generate 7 post formats optimized for LinkedIn reach: 500-800 word long-form essays with structural guidance, hot take / contrarian posts (3 templates), story posts (3 narrative templates), listicles with numbered lessons and X-vs-Y frameworks, 10-slide carousel scripts with captions, a 20-hook opening line library by category, and comment engagement prompts with reply strategy. Includes best posting times and algorithm tips. For B2B founders, consultants, and thought leaders.
Enter your newsletter niche, audience, this issue's topic, and key insight. Get AI prompts for 10 subject line options, a full issue draft outline with section-by-section writing guidance, a 30-day editorial calendar with 16 issue angles, a multi-platform repurposing plan (LinkedIn, Twitter, video, carousel), and a 5-email welcome sequence for new subscribers. For creators, consultants, and brand newsletters.
Enter your product, audience, transformation, and price. Get AI prompts for a complete launch system: 5-email pre-launch sequence, cart open announcement, 6 daily sales emails (case study, "what if," objection day, proof stacking), 3-email cart close urgency sequence, objection crusher emails, and buyer/non-buyer post-launch sequences. For online courses, coaching programs, SaaS, and digital products.
Enter your consulting specialty, client problem, proposed solution, timeline, and fee. Get AI prompts for a full executive summary, detailed scope of work with phases and deliverables, 3-tier pricing options, project timeline, proof and credentials section, ROI justification calculator, 6 objection response scripts, and a 3-email post-proposal follow-up sequence. For consultants, agencies, and freelancers.
Enter your business, service, client name, and the result you delivered. Get AI prompts for 3 request email variations, SMS and DM scripts, guided question sets clients can answer in minutes, video testimonial scripts, a 3-touch follow-up sequence, full case study interview questions, and AI prompts to polish raw client responses into publish-ready testimonials.
Enter your role, niche, superpower, and audience. Get AI prompts for brand positioning statements, 3 content pillars with post angles, bio variations in 4 lengths (Twitter, Instagram, LinkedIn, full speaker bio), a 30-day content calendar, signature framework creation, 10 lead magnet ideas, partnership outreach scripts, and podcast/speaking pitch templates. For founders, consultants, creators, and coaches.
Enter your niche, video topic, and target length. Get AI prompts for 10 hook scripts across every framework (bold claim, confession, controversy, cliffhanger, question), full 15/30/60-second video scripts with visual direction, caption copy and hashtag sets, 30-day content batches, 5-part series arcs, and complete repurposing plans. For YouTube Shorts, Reels, and TikTok.
Enter your crisis type, situation, and current status. Get AI prompts for complete crisis response — holding statements, full public statements, social media response templates, customer email sequences, internal team memos, media Q&A prep, recovery messaging plans, and hour-by-hour response timelines. For brands, founders, PR teams, and community managers. All outputs are draft frameworks for legal review.
Enter your affiliate product, personal experience, and honest downsides. Get AI prompts for complete affiliate content — long-form review posts, 5-email promo sequences, vs. comparison articles, YouTube review scripts, social media posts (Twitter thread, LinkedIn, Instagram, Reels), SEO article briefs, tutorial content, and FTC-compliant disclosure language. For bloggers, creators, and newsletter writers.
Enter your expertise, credentials, and contrarian angle. Get AI prompts for your complete podcast guest system — 4 pitch email formats, 5-length speaker bios, 10 pitchable topic angles, talking points and story bank, intro/outro scripts, 20 signature one-liners, post-episode promotion content, and host relationship follow-ups. Turn podcast guesting into an authority and lead-gen machine.
Enter your offer, audience segment, and objection. Get AI prompts for complete retargeting campaigns — 30 headlines, 10 primary text variations, 15 video hooks, carousel sequences, dynamic ad templates, email retargeting sequences, objection-busting ads, and social proof formats. Segmented by behavior: visitors, cart abandoners, warm leads, past buyers.
Enter your product, ICP, and deal size. Get AI prompts for your complete sales call playbook — 5 opening scripts, discovery question banks (situation, problem, implication, vision), 3 pitch frameworks, full objection handling scripts, demo talk tracks, 6 closing techniques, voicemails, and post-call follow-up emails. For B2B reps, founders, and closers.
Enter your product, aha moment, and churn failure points. Get AI prompts for your complete onboarding system — 5-email welcome series, behavior-triggered activation nudges, milestone celebration emails, in-app tooltip and empty state copy, check-in call scripts, and churn early-warning interventions. For SaaS, agencies, and course creators.
No vaults match your search.
Try a broader term like "email", "image", or "proposal".
All prompts are written to work with any large language model. Platform-specific guidance is labeled where it matters (like image generation).
We add new vaults and update existing ones regularly. Get notified when new collections drop.
Yes — completely free, no signup, no credit card, no usage limits. It runs entirely in your browser.
You fill in your details, and the tool builds expert-level prompts around them. Copy a prompt into ChatGPT, Claude, or Gemini and the AI writes the full result. The structure of the prompt is what makes the output dramatically better than asking the AI cold.
No — the prompts work with the free tiers of ChatGPT, Claude, and Gemini. Paid models produce somewhat richer output, but the free versions handle these prompts well.
Every prompt here is structured — role, context, constraints, output format — instead of a one-liner. That structure is what turns a mediocre AI answer into a usable one.
No. Nothing you type is sent to a server or stored — the page has no backend. Close the tab and it's gone.
Same network — every tool is free, needs no signup, and runs entirely in your browser.