You can access your "Inbox" from the upper right of the dashboard page or from the sidebar. The inbox stores those email notification that you have chosen to receive when certain actions happen within the system. To edit notifications go to the email preferences tab.
A Notification provides information on an action that has occurred.
You have the ability to mark one, more or all important messages that you have read to Unread as a reminder to re-visit. You also have the ability to delete one, more or all messages you have read and no longer need.