the history of animation.
The first type of animation was the zoetrope, this consisted of a cylindrical shape with slits in it and a step by step picture on the inside of a moving picture so when spun every time you could see through the slits you would be looking at the opposite picture, so every time it would reveal the next picture so it would seem as if it was moving.
After some time the animation industry slowly began to progress into stop motion animation, this consisted of i.e. a clay model (claymation), and a picture would be taken then the clay model would be moved ever so slightly and another picture would be taken etc etc... so when the pictures were put together and played quickly it would look as if the clay model was moving.
But throughout the time of animation many people have came up with other cheap and much easier ways to animate, one of which is possibly the easiest is the flick book. This is basically a book, and on each page there is a picture but as you go to the next picture the person or object is drawn in a different way i.e. an arm moving, on one page it would be by the waist and the next page it would be slightly lifted so when the book it being flicked through it looks as if the arm is moving.
But probably the most technical is computer based animation, this usually requires most detail and time when editing or making objects or figures and then to make them move. Basic animations are made in 2D this is where there is no 3rd dimension and this is a lot less complicated and requires a lot less time and effort. this is mostly used in flash animation as it is the most simplest and easiest to use.