The Internet would be a very lifeless place if it weren't for animations. Whether they be 2D, 3D, motion graphics (such as animated GIFS), Japanese Anime, avatars, messaging emoji or stickers, animated data visualizations, Superhero or villian imagery, or even CAPTCHA and QRCodes that wiggle, the web is filled with these colorful, often movable images.
Developers wanting to make their applications come alive with animations, or simply add data about animations to their apps, need the proper APIs to get the job done.