Here is how Google describes NotebookLM (it’s a little wordy…) - 

“NotebookLM is an AI-powered tool designed to enhance understanding and synthesis of complex information from uploaded sources. Users create notebooks and upload documents, URLs, or other text-based materials, which then become searchable and analyzable by the AI. NotebookLM can generate summaries, outlines, study guides, and audio overviews, and it also answers questions grounded in the user's specific sources, providing inline citations for verification.”

Our summary of this is that you can use Google’s powerful AI tools to interact with your data