A simple form of animation which was very popular on the Web in its early days and is still frequently seen. It consists of drawing a number of GIF graphics which differ slightly from each other and displaying them sequentially. For example, a simple animation which consisted of a dog walking across a banner advert would be created by drawing separate pictures of the dog in slightly different positions along the path that it walks, and then displaying each picture for a short period of time. This form of animation is just the electronic equivalent of the flick books which have been used by children down the ages. Writing a program to carry out simple GIF animations is straightforward. There are, however, a number of tools which enable you to implement animations without carrying out any programming. Some of these tools are shareware. See also GIF animation tool.