Generally Callout shapes are connected to another figure or visual — and these shapes contain some text. Callouts are not just any shape — most of the time, callouts also have an attached line, arrow, or another pointer style that identifies it 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 2013 for Windows.

