RAG
RAG means the answer comes from a note you saved. The course has three steps: cut the note into sections, find the section that shares words with the question, then answer from that section.
In the product, knowledge=[a file] stores the note and the agent searches it. That store is not installed on this site, so these pages use the same search idea with KeywordIndex. Start after Agents. Graph search and vector databases stay in the docs.