1.1.1. Definition Animation

An early way of animation was the flip-book which can be tinkered by every child: You draw a series of pictures that vary gradually from one picture to the next. You then make a book out of these pages, so that when the pages are turned rapidly, the pictures appear to animate by simulating motion ar some other change.
Here is an example of such pictures:

A series of pictures that vary gradually from one picture to the next (www.sportunterricht.de)

The resulting flip-book looks as following:

In computing we already speak of an animation. Therefore, we can define animation as follows:

Definition

Animation is the optical illusion of motion - that means the change of attributes - created by the consecutive display of images of static elements (Wikipedia)