The first form of animation was a children's toy called a Thaumatrope. Thaumatropes were small pieces of paper with string on 2 sides. It had a picture on one side of the paper and a different picture on the other side. When it was spun with the string it would bring the 2 pictures together. In the example on the right, when spun it looks like the bird is in the cage.
Later another optical toy was created called a Zoetrope. Zoetropes are similar to thaumatropes except instead of the paper on string, it is inside of a drum that is spinning. The drum has slats cut into it so that the animation can be seen.
A massive pionneer in animation history is, Joseph Plateau. He was the man who figured out what we know now today as, "frames". The way he figured out that a motion of still images can create the illusion of movement is because of his invention the, phenakistoscope. This was a small device that used counter rotating disks repeating drawn images in small increments of motion on one and regularly spaced slits in the other.
Charles-Émile Reynaud was also a great pioneer. The reason for that is because he created an invention called the, "Praxinoscope". Creating the Praxinoscope means that Reynaud was the first person to be able to display animated cartoon films. Reynaud created the praxinoscope in 1877 and it is known to have been one of the first known instance of film performations being used.
Eadweard Muybridge was an English pioneer in animation. The reason why he is a great pioneer is because of his styudies of motion picture projection. Another reason why he became a pioneer is because of his large photographs of Yosemite Valley, California. They made him world famous. With the fame helping him, in 1877 and 1878 he focused on animal locomotion, which used multiple cameras to capture motion. He also invented a device called the, "Zoopraxiscope" which was a device for projecting motion picture.
Thomas Edison is known for many advancements but the one most relating to animation was the creation of the kinetoscope in 1888. The knietoscope was designed for a single person to view the film at a time. Although it wasn't a projector, it did introduce the approach that became standard with the advent of video.
Walt Disney was important in the development of animation. Disney used cell animation to create films and used a special camera, called a multiplane camera. The multiplane camera that Disney used was created in 1933 and was a special motion capture camera that moved several pieces of artwork past the camera at different speeds and distances to create a 3d effect.