Type "animals that live in the ocean" into a normal search box and it hunts for the words animals , live , ocean . An article titled "Blue whale" that never uses any of those words? Missed. Today we fix that. We'll build a search engine that matches on meaning , so "animals that live in the ocean" surfaces Blue whale and Coral reef — no shared keywords required. The whole thing is a few hundred lines, runs on free tooling, and needs no API key . The two ideas you'll walk away understanding are t