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What is Navigation Drawer ?

The navigation drawer is a panel that transitions in from the left edge of the screen and displays the app’s main navigation options.The user can bring the navigation drawer onto the screen by swiping from the left edge of the screen or by touching the application icon on the action bar.As the navigation drawer expands, it overlays the content but not the action bar. When the drawer is fully extended, the action bar adjusts its content by replacing the current action bar title with the app name and removing all actions that are contextual to the view underneath the navigation drawer. The overflow menu with the standard action items for Settings and Help remains visible.
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