A Callout is a shape that contains some text. But callouts are not just any shape — most of the time, they are connected to another figure or visual. Callouts also have an attached line, arrow, or another pointer style that identifies them with a certain figure or visual. So in simple terms, callouts are those extra shapes with text that add value to other visuals. On their own, you’ll hardly find callouts used anywhere.
Learn about Callout shapes in PowerPoint 2011 for Mac.

