It watches your account and displays a notification when someone else logs into your account. Basically a nice little feature from Gmail team that lets you check if someone has hacked into your Gmail account.
When you’re in Gmail go all the way down to the bottom of the page. There you should see something starting with “Last account activity …” click the details link, that’s the feature I am going to tell you about.
How to Check if Somebody Is Logging Into Your Gmail Email Account
How to Check if Somebody Is Logging Into Your Gmail Email Account
