Music videos are short films that relate imagery to a song, usually made for artistic and promotional purposes. They began as animated shorts that featured popular musicians performing their songs, and evolved into promotional clips made by artists like The Beatles in the 1960s. The launch of MTV in 1981 brought music videos into the mainstream as a central part of music marketing. Today, websites like YouTube have made it easier than ever to view and share music videos online, which many artists now rely on for free promotion and advertising.