This document outlines the twelve principles of animation as introduced by Disney animators Ollie Johnston and Frank Thomas. The principles are: squash and stretch, anticipation, staging, straight ahead and pose to pose animation, follow through and overlapping action, slow-out and slow-in, arcs, secondary action, timing, exaggeration, solid drawing, and appeal. Each principle is described in 1-2 sentences with examples to illustrate how it can be applied. The principles aim to make animated movements and characters more natural, dynamic, and engaging for audiences.