by Amit Shekhar · 23 July 2026
How does Semantic Search work?
How Semantic Search works. We will also see why we need it, how it actually works step by step, and where it is used in real systems like search engines, AI assistants, and recommendations.
Read on Outcome School ↗then come back to lock it in
Before you read, guessWhat is the limitation of keyword search regarding word matching?
Ten seconds, a guess, then read — a wrong guess still makes the answer stick.
What this article covers
- What is keyword search
- Where keyword search fails
- What is Semantic Search
- What is an embedding
- How similar meanings sit close together
- How we measure closeness with cosine similarity
- What is a vector database
- The full Semantic Search flow
- Approximate nearest neighbor for speed at scale
- Semantic Search in the real world
The article lives on outcomeschool.com. Read it there, then come back: the tutor in the margin has read it and will answer questions, and the questions below check what stayed.