For example, the IP address assigned to your device is used to send the data you requested back to your device. Also, some of our cookies on your device help us to authenticate you as the person who may get access to your Google Account.
For signed-in users, another example is that the photos you upload to Google Photos are analyzed to create stories out of them that you can share. Learn more. Also, a flight confirmation email that you received may be used to create a “check-in” button that appears in your Gmail. Learn more.