Skip to content
The Internet
Compass
Companies
All companies
Browse the full company database
Product Hunt launches
Ranked launches and what they do
Publications
Who covers technology, and how
Software
All software
The full software directory
Categories
Market-level analysis by category
Alternatives
Credible replacements for any tool
Comparisons
Head-to-head, scored on shared criteria
Best-of lists
Ranked shortlists by use case
Careers
Salaries
Bands by role, level and market
Jobs
Demand, openings and hiring employers
Cities
Technology market guides
Tools
Graph
Repositories
Open source, ranked by GitHub stars
Packages
npm and PyPI, synced from the official registries
People
Founders and maintainers
Papers
Research sourced from arXiv
Knowledge
Glossary
Plain definitions of the working vocabulary
Guides
Practical, in-depth how-to
Analysis
Market and structural analysis
Lists
Ranked editorial shortlists
Search
⌘K
Free Tools
Home
/
Glossary
Glossary
The working vocabulary
50 plain, answer-first definitions — no jargon explaining jargon.
AI
Large Language Model (LLM)
Token
Context Window
Retrieval-Augmented Generation (RAG)
Embedding
Vector Database
Semantic Search
Prompt Engineering
Fine-Tuning
Hallucination
Model Evaluation
Inference
Model Context Protocol (MCP)
AI Agent
llms.txt
Engineering
API
REST API
GraphQL
Webhook
Idempotency
Rate Limiting
SDK
Go-to-market
Product-Led Growth (PLG)
Bottom-Up Sales
Marketing
Programmatic SEO
Canonical URL
Structured Data
Internal Linking
Crawl Budget
Core Web Vitals
Metrics
Annual Recurring Revenue (ARR)
Monthly Recurring Revenue (MRR)
Net Revenue Retention (NRR)
Gross Revenue Retention (GRR)
Churn Rate
Customer Acquisition Cost (CAC)
Customer Lifetime Value (LTV)
CAC Payback Period
Burn Multiple
Committed ARR (cARR)
Pricing
Freemium
Usage-Based Pricing
Product
Product-Market Fit
North Star Metric
OKR
Security
Zero Trust
Single Sign-On (SSO)
SOC 2
Venture
Runway
Total Addressable Market (TAM)