Gemini is an AI-powered chatbot from Google that can summarize texts, generate images, and learn from user interactions. It retains both textual and spoken data by default, raising privacy concerns. Users can manage their activity by navigating to Gemini's web app, where they can delete activity based on various time frames or remove individual activities. Users can also turn off activity saving and adjust auto-deletion settings for data older than 3, 18, or 36 months. To delete a chat in Google Messages, users can tap the three-dot icon and confirm deletion. Gemini is the default virtual assistant for the Google Pixel 9 series and is expected to be pre-installed on many top Android devices.