NotebookLM is Google's powerful AI research and thinking partner in 2026, powered by Gemini 3, turning uploaded sources (PDFs, docs, videos, audio, websites) into summaries, insights, Audio/Video Overviews, quizzes, flashcards, slide decks, infographics, data tables, and more. Fully grounded in your trusted content with no hallucinations. Free core access; Pro/Ultra tiers via Google AI plans for higher limits and advanced features—ideal for students, researchers, professionals, and teams.