Hand-drawn animation is a traditional form of animation where each frame is created by artists drawing images by hand. This technique involves creating a series of individual drawings that, when played in sequence, create the illusion of movement. It has been used in many classic films, such as those produced by Walt Disney. In hand-drawn animation, artists often use paper and pencils, but digital tools can also replicate this style. The process requires a lot of time and skill, as animators must ensure that each drawing is consistent with the others to maintain fluid motion.