Leaders
Leaders are text boxes with a connected arrow that help you point out and explain specific features of a drawing. They attach to other drawing shapes and provide an editable text box, into which you can enter whatever is required to make your drawing clear and understandable. After you've placed a Leader on your page you have several options for modifying it.
Text
Text fields enable you to place and enter text anywhere on a drawing. Text fields are free-floating and cannot connect to other shapes.