A cubic Bezier curve is a non-linear segment defined by four control points. The Bezier curve starts at control point 0 (start point) and ends at control point 3 (end point). The start point and control point 1 define the tangent at the start point. Control point 2 and the end point define the tangent at the end point. The length of these tangent lines and position of the 4 control points determines the shape of the created Bezier curve.