What Is NotebookLM Used For?
NotebookLM is used to ask questions about documents you supply and to turn those documents into study aids. Google renamed it Gemini Notebook in July 2026. The student page says it is the same product and that existing notebooks stay available. You still open it at notebooklm.google.
The job has not changed. You add sources. Chat answers from those sources, with citations. In Studio you can generate a study guide and an Audio Overview. That is research and review sitting on top of a pile of files. It is not a syllabus you work through in order.
What you put in
A notebook is a set of sources for one project. On the computer, Google's source help lists what you can add: PDFs, Word, text, Markdown, PowerPoint, CSV, Google Docs, Google Slides, Google Sheets, audio, images, ePub, pasted text, and web URLs. A web URL contributes the text of that page. Paywalled pages are not supported, and images or embedded videos on the page are not imported.
Public YouTube links are sources only when the video has captions. Gemini Notebook imports the caption transcript, not the video. Videos without speech are not supported, and a video uploaded in the last 72 hours may not import yet.
On Android, Google's app help lists a shorter set: PDF, website, YouTube, audio, and copied text.
Grounded answers
Chat summarizes the sources and answers questions against them. Google's overview describes this as grounded information with in-line citations. You choose the documents, so the reply is tied to that set rather than to a general web answer. If you need the sentence that a claim came from, the citation is the point of the tool.
That constraint is also the limit. The notebook will not decide a lesson order, tell you what to skip, or keep a record of what you have practiced. When you close the chat, the sources are still a pile.
Study guides and audio overviews
Studio is where formatted outputs are generated. Google's create-a-notebook help lists reports you can request, including a study guide, an FAQ, and a briefing document. Notes can also be turned into a study guide: the notes help says that action includes key questions and a glossary.
Audio Overviews are a separate Studio output. Google's Audio Overview help describes them as discussions between AI hosts that summarize the key topics in your sources, meant as a reflection of that material. The default format, Deep Dive, is two hosts. Brief is a single speaker and a short take. Critique and Debate are the other documented formats. You can set a language and add a prompt so the overview stays on a topic. Google notes that the audio is generated and can be inaccurate.
People use this when the goal is to interrogate a packet: a stack of papers, a meeting transcript, a chapter, a policy. You upload, you ask, you listen, you check the citation.
NotebookLM course
People search for a NotebookLM course for two different jobs, and mixing them up wastes the afternoon.
The first search is a course on NotebookLM: which sources to add, how Chat citations work, and when a study guide or Audio Overview is the right output. The product itself does not enroll you in that course. The Gemini Notebook help center is the reference. If you want that reference as lessons you actually take, put a prompt or a saved PDF of the help pages into a course builder. Ailurn turns a prompt, PDF, or repo into a course. It does not watch YouTube, including a YouTube source you attached in a notebook.
The second search is about the sources already in the notebook. People want those PDFs, docs, and notes turned into a course: a sequence, practice, and a place to stop for the day. Gemini Notebook will not do that. A study guide and an Audio Overview are still outputs about the sources. They do not become modules with a next lesson.
For that second job, export or download the document you care about and turn the PDF into a course. A pasted prompt works the same way in the AI course builder when you do not have a file yet. The comparison of the two tools, source Q&A against a course you take, is on Ailurn vs NotebookLM.
Use Gemini Notebook when you need an answer that stays inside a set of files, a study guide from those files, or an audio summary of them. Use a course when you need to learn the material in order and practice it. A notebook full of sources is the input. It is not the course.