Everyone in the AI era has heard of RAG. But ask someone to actually explain it , What exactly is RAG? and you’ll watch them fumble, or quietly search it under the table.

I don’t think that’s their fault. Software concepts can be genuinely hard to visualise, and most explanations just throw definitions at you. So you memorise the words… and forget them by the next day.

I believe visuals, diagrams, and a good analogy make a concept click so it sticks, instead of sitting in your short-term memory until it evaporates.

This episode is my attempt to make RAG that easy. I’ve taught it through one running analogy — the open-book exam — followed all the way down, in stick figures, with zero jargon left unexplained.

The goal: next time someone wakes you up in the middle of a dream and asks “What is RAG?”, you can explain it without blinking.

And once it truly clicks, you can actually use it in your own projects, your own use cases instead of just nodding along in a meeting.