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The second most common method of organizing controllers within an application, the first being the Navigation Controller.

A tab bar controller adds a set of buttons to the bottom of the screen, each which represent a view controller. The user can switch between controllers by pressing the buttons.

It is common to nest UINavigation controllers within tab bar controllers to allow the user to drill down a nav stack for each tab. In this case, each tab of the tab bar controller maintains a different nav stack and keeps them completely isolated from each other.

Implement a tab bar controller in code or in InterfaceBuilder.

A TabBarController has no limits on the number of controllers it may supervise.