Hand-drawn animation is the oldest form of animation where each frame is drawn by hand, as opposed to modern computer animation. It was most popular in the 1930s and involves drawing each frame to create the illusion of movement when viewed as a continuous sequence. Some classic examples of hand-drawn animated cartoons include Walt Disney's 1928 Mickey Mouse short Steamboat Willie, the Tom and Jerry series from Warner Bros., and the Nickelodeon show Rugrats.