A balloon is a label with an arrow that points to an area on your drawing. The balloon and the pointer are joined by a line, called a leader.
You can use balloons to:
For example, the following chainsaw handle has a fillet surface on the support handle on the side:
You can use balloons to label the model to show the details. A key is provided in the bottom right corner explaining the code of each balloon:
You can see from this example that there are different types of balloons that you can create.