Why it matters
It answers only from the sources you gave it, so citations point at something you can actually check.
Google NotebookLM
In daily useA source-grounded research assistant for organizing documents and finding insights.
NotebookLM inverts the usual assistant setup: instead of answering from the open web, it answers from the specific set of documents you upload, and every claim links back to the passage it came from. That constraint is the whole value — for literature review, contract sets or interview transcripts, a citation you can click and verify beats a fluent answer you have to re-check. The Audio Overview feature, which turns a notebook into a spoken discussion, turned out to be the thing most people remember it for.