In graphics we need how to describe and represent any curve in graphically either in line form or in circle etc. For some curves, the problem of naming them is easy since they have known shapes: line segments, circles, elliptical arcs, etc. A general curve that doesn’t have a “named” shape is sometimes called a free-form curve. A free-form curve can take on just about any shape, they are much harder to describe. A curve as something you can draw with a (thin) pen on a piece of paper.