For some, animation can be a challenge. For others, animation can be as easy as pie. Animation can be made using a few 3D programs such as Milkshape 3D, Autodesk 3DS Max or Maya. To simplify things, animation is made by moving bones and seting it and then move to another frame and move it and so on. Animation is used in almost every game. A walk or jump of a character in a 3D game is also animation. Animation is also used for 3D movies such as Up. Therefore, animation is a very important thing in the making of 3D games or films.
I've tried animating. It can be hard at first but after some time, it gets easy. Here's an example of animation in motion:
Ultimecia from Final Fantasy 8