Cel Animation

Cel (celluloid) based animation is generally just how you would see every cartoon these days which is showcased on TV for example dragon ball z is perfect example of this as you know that the artists who have made this animation have drawn out each frame by frame to create a little short episode which could take up to weeks or months to even create one episode depending on how many animators they have as they'll all need to make sure that they each have the same colour pallet as each other in order to have consistant colouring and shading. Most of the Cel based animations stopped for some animators in about the early 90s as thats when most animation studios for example Disney started to used CAPS (Computer Animation Production System) which replaced what was originally Cel in the overall element of animation.

The process seems to be simple enough as if they had to draw the background then they could just overlay bits of over cel based animation over the top of this: