School forgive me from taking this from wiki Inbetweening, also commonly known as tweening, is a process in animation that involves generating intermediate frames, called inbetweens, between two keyframes. The intended result is to create the illusion of movement by smoothly transitioning one image into another

Or lol just like Take a layer with like lets say the tail and make it move smoothly Use the same Picture but make the layer move as if it were alive

Nah here lemme show ye

Im not sure :l I am no expert, Instead i am a complete fool

Neither will I :l