Google Sign-In is a secure authentication system that reduces the burden of login for users, by enabling them to sign in with their Google Account—the same account they already use with Gmail, Play, and other Google services.
Google Sign-In is also the gateway to connecting with Google’s users and services in a secure manner. Users have the opportunity to pay with Google Pay, share with their Google-wide contacts, save a file to Drive, add an event to Calendar, and more. Integrate Google’s user-centric APIs and services inside an app to help users take action and convert.