Sign-In to Multiple Gmail accounts with Google's Multiple Sign-In

Google officially announced a new feature called Multiple Sign-In for its users, with which Gmail Users will be allowed to switch between multiple Gmail accounts without log out. This means after you logged into Gmail with one username and password, you will be able to sign into two more(maximum) Gmail accounts. You can switch between these accounts very easily. You can activate Multiple Sign-In feature by visiting https://www.google.com/accounts.