Google announced on Thursday a significant upgrade to its AI note-taking and research assistant NotebookLM, bringing users a smarter and more personalized experience. This update focuses mainly on the highly anticipated audio overview feature, allowing users to guide the AI-generated conversation content more precisely, concentrating on specific topics rather than just generating comprehensive audio summaries. Since its launch last month, the audio overview feature of NotebookLM has rapidly gained popularity due to its podcast-like AI-generated conversation format, with many users beginning to share their experiences on social media.