You can use tablets to draw digitally in a drawing or animating program , one of the most known brands for tablets are Wacom, and the program for drawing some use is paint tool say, and for animating is macromedia flash player 8 or adobe flash player. animation is made by drawing something , which is called a frame when you animate, the follow it by another drawing, or another frame, and keep doing is like its moving, and when you're done, you play it ll as one, and it becomes an animation, heres an example of an animation:https://www.youtube.com/watch?v=3_kc80dPD5g