The Google Credential Provider for Windows is used to enable users to sign in to their Windows devices using their Google account credentials. It allows for seamless integration between Google accounts and Windows devices, providing a convenient and secure authentication method. With this credential provider, users can utilize their Google credentials to log in to Windows machines, access files and resources, and enjoy the familiar Google services within the Windows environment. It eliminates the need for maintaining separate credentials and simplifies the login process for users who heavily rely on Google services.