Gmail with Google plus

Google+

Google done some implementations with Gmail accounts, now these days if you are signing up for a new Google account(including YouTube also) it is necessary to have a Gmail account. Well in simple way when you people sign up for a new Google account, at that time you will get a Gmail as well as a Google+ profile automatically registered to you.
This new experiment really much easier for new users making the account once and helpful to set up everything at once not to sign up separately for Gmail and Google+ account.

Gmail

 If a new user not interested in Google+ so there are no boundation to create this profile or do not join friends on that account. This experiment is implemented by Google to creating awareness about Google+. Many users don't use Google+ account so this step has been taken by Google operating system to popular Google+.