what is an action bar.
Actionbar is replacement of options menu. This feature is added in 3.0 version.
In old android versions important menu items were displayed in options menu, which will be displayed only when user presses hardware menu button.
Action bar design is similar to how we display important menu items in a web site on top bar. Action bar will contain set of important action items on top bar of your application. Irrespective of which screen you are navigating to, android will display important action items on top bar which is always visible to user.
For more info please visit official android site: http://developer.android.com/guide/topics/ui/actionbar.html
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