Animation is the process by which we can make the pictures move continuously. Each picture is like a shot on film one at a time and is shown at the rate of 24 pictures per second making the pictures appear to move. By using Animation we can display a sequence of images of 2-D or 3-D artwork model positions in order to create an illusion of movement.
2D animation is the process of creating of moving pictures in a two-dimensional way, through "traditional"cel animation or by using computerized animation software. We can create the moving pictures in a 2-Dimensional environment; this can be done by sequencing of consecutive images, or "frames" that simulate motion by each image showing the next in a gradual progression of steps. The 2D pictures are created / edited on the computer by using 2D bitmap graphics or 2D vector graphics.
Simple to say, creation of moving pictures in a three-dimensional environment. In this we can animate the objects in a three-dimensional way, which appears in a three-dimensional space. The 3D objects can be rotated and moved like real objects. By using 3D animation we can develop the gaming applications and virtual reality, it may also be used in presenting graphics to add flair to the visuals.