2D & 3D Animation : 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.