Anchor points

If you draw a line —or a segment— on a piece of paper, you start at a given point, i.e. where you put your pencil on the paper, and you stop at another point, where you remove the pencil from the paper. In line art, these points are called anchor points. Logically, if you move these anchor points, you will change the path segment and perhaps the shape of the path.

Figure 1. Anchor points (A, B and C) define the beginning and the end of each segment.