In Gmail, now you can sort emails as per content:- in Primary, Social, Promotions, Updates and Forums. Primary is all the person-to-person mails; Social are emails from social networking sites; Promotions are the marketing emails; Updates are autogenerated receipts, confirmations, etc.; and Forums contain mails from online groups and discussion boards. If you don’t find it already enabled, you can click on the gear in the top-right on the main Gmail page and under the menu, click on 'Configure inbox', and select tabs to enable. You can uncheck to go back to the old inbox.