Google collects a wide range of data about you including your search history, location data, device information, usage data of Google services, cookies and tracking data, your account information (such as name, email, phone number), Gmail data, voice search data, YouTube viewing history, and ad interaction information. This collection happens across various Google services like Google Search, Maps, YouTube, Gmail, and Google Assistant. You can check what Google knows about you by signing into your Google account, navigating to the "Manage your data & privacy" section, where you can see your activity history, ad personalization details, location history, and more. Google also offers tools to manage, download, or delete this data, as well as options to turn off certain types of activity tracking for enhanced privacy. In addition, Google gives controls to decide what personal information like your birthday, phone number, or profile picture is visible to others across Google services. This data can help Google personalize your experience and target advertisements, but it's also stored and associated with your Google profile. For safety and privacy, you can also manage or turn off location tracking and web/app activity tracking from your account settings. In summary, Google knows about your personal info, online activities, locations, device details, and interactions with its various services, and it provides ways for you to review and control this information.