cel animation
A traditional form of animation used in the production of cartoons or animated movies where each frame of the scene is drawn by hand. A full-length feature film produced using cel animation would often require a million or more drawings to complete.
A cel is a sheet of transparent cellulose acetate used as a medium for painting animation frames. It is transparent so that it can be laid over other cels and/or a painted background, then photographed.

drawn on film

Drawn on film animation, also known as animation without camera, is an animation technique where footage is produced by creating the images directly on film stock, as to any other form of animation where the images or objects are photographed frame by frame with an animation camera.On blank film the artist can draw, paint, stamp, or even glue or tape objects. Black film can be scratched, etched, sanded, or punched. Any tool the artist finds useful may be used for this, and all techniques can be combined endlessly.

 painting film 

Drawn-on-film animation, also known as direct animation or animation without camera, is an animation technique where footage is produced by creating the images directly on film stock , as opposed to any other form of animation where the images or objects are photographed frame by frame with an animation cameraThere are two basic methods to produce animation directly on film. One starts with blank film stock, the other one with black (already developed) film. On blank film the artist can draw, paint, stamp, or even glue or tape objects. Black film (or any footage) can be scratched, etched, sanded, or punched. Any tool the artist finds useful may be used for this, and all techniques can be combined endlessly.