We use data to show you personalized ads. Depending on your settings, if you're signed in to your Google Account, we may show you personalized ads based on your interests and activity across Google services and sites and apps that partner with Google to show ads.
This is the core commercial use of your data. It means a health search in Google Search, a video watched on YouTube, and a location visited can all be combined to infer sensitive characteristics and serve targeted ads without your active awareness.
Google collects a wide range of personal data including location history, search queries, emails (for feature delivery), browsing activity on third-party sites via Google's ad network, voice and audio data, and device identifiers, combining these across all Google services to build detailed user profiles. This cross-service data combination powers Google's advertising business and means your activity on one Google product can influence what you see on entirely different products and third-party websites. You can review and delete your data, turn off ad personalization, and manage location history at myaccount.google.com/data-and-privacy.