The Bezier Curve is the mathematics behind the "Pen Tool" a graphic designer's primary drawing tool. A Bezier Curve is a curved line in which its shape is defined by a mathematical equation. They are used in vector applications such as Adobe Illustrator and Photoshop as well as InDesign and Quark Express. It consists of two anchor points and levers that control the angle at which the curves leaves the end points. Without Bezier curves it would be almost impossible to produce the multitude of unique and beautiful designs.