The Bezier Pen and Region tools draw Bezier lines and regions. Bezier curves are not only useful, but a lot of fun as well. You can use them to create uniquely curved objects and templates; and complex, graceful animation paths.
The Bezier Pen tool can be used to draw Bezier lines or Bezier regions. To switch from one pen tool type to the other, hold down the tool on the Tool palette, then select the desired pen tool from the tool's pop-out.