Vector Index
A data structure that makes nearest-neighbor search fast.
/ quick answer
A vector index (HNSW, IVF, ScaNN) organizes embeddings so you can find the top-k neighbors in milliseconds instead of scanning every row. Trade-off: build time and memory. A data structure that makes nearest-neighbor search fast.
/ frequently asked
What is Vector Index?
A vector index (HNSW, IVF, ScaNN) organizes embeddings so you can find the top-k neighbors in milliseconds instead of scanning every row. Trade-off: build time and memory.
What is an example of Vector Index?
pgvector's HNSW index on a 1M-row table returns top-10 neighbors in ~5ms.
Why does Vector Index matter?
A data structure that makes nearest-neighbor search fast.
What should I learn after Vector Index?
Open the related workflows and prompts further down this page: they show how this idea is applied in a real task, step by step.
/ continue exploring
Related concepts
The vocabulary this page depends on.
- →Retrieval
Selecting the most relevant chunks for a query before generation.
- →RAG (Retrieval-Augmented Generation)
Inject external knowledge into an LLM at query time.
- →Agentic RAG
RAG where an agent decides what to retrieve, when, and from which source — instead of a single static query.
- →Embedding
A numerical vector representation of text, image or audio that captures meaning for similarity search.
Related workflows
Turn this into a repeatable process.
- →How to Create a Website with AI
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- →How to Build an AI Content System
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- →How to Start a Niche Website with AI
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- →Personal Research Assistant Workflow
A repeatable system to research any topic deeply in under 30 minutes.
Related tool stacks
The tools that run it in production.
- →RAG Starter Stack
Minimum viable stack to ship a production RAG chatbot.
- →AI Research & Knowledge Stack
Default toolset for analysts, founders and creators doing deep research with AI.
Comparisons & alternatives
Pick between the options.
- →ChatGPT vs Claude
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- →Lovable vs Bolt
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- →OpenAI API vs Anthropic API
Choosing between the two leading LLM API providers for production apps.
- →Lovable vs Cursor
Prompt-to-app builder vs AI-assisted code editor — which one should you reach for?