Animation - Path

The path animating technique is probably the easiest technique to use. first you create a path, whether it is a line, or a rectangle, circle or even a free drawn line. Next Place an object on the path by going to "Animation" - "Constraints" - "Path Constraints". With the object or camera selected click on the line, which will place the object on the path. When the animation plays the object will move around the path.

In this case the ball has been linked to the circle, when the animation plays the ball will move around the circle.