Hub is the best new feature of BlackBerry 10, and it's one every other smartphone software maker should consider copying.
In a nutshell, Hub gathers all of your communication channels -- phone, text, chat, email, Facebook, Twitter, etc. -- and piles them all into a single stream of information. All of your notifications, missed calls, emails, and more are ready for you, hiding behind the homescreen.
Hub absorbs the collective chatter of your networks and makes it easy to respond. You send texts, reply to emails and posts status updates right from Hub.