Animation is a field of art or science that has the capability to impart life and zeal to non living characters. Basically it is based on the phenomenon of persistence of vision that allows the visual illusion of the objects. It is a phenomenon of an eye in which an image continues to appear in one’s vision after the exposure to the original image has ceased. This happens for about one twenty-fifth of a second. In early days animation was restricted to only hand drawings.
The basic difference between 2d and 3d can be illustrated by drawing a rectangle and a cube. Rectangle is a 2D figure whereas cube is a 3D figure. 3D presents the object from every possible direction like in real life. 2D bitmap or vector graphics are used to create 2D animation figures.