The format of the show involves Beavis and Butthead watching music videos and making lewd, stupid comments. Storys are advanced inbetween videos and targets for their carnal humour include authority, high school life and even themselves.
A full length movie, [Beavis and Butthead Do America]? was released in 1996
Beavis and Butthead along with other (arguably) mainstream cartoons such as Ren and Stimpy and the The Simpsons pushed the boundaries of cartoons away from clean material for small children only.
Along with the usual merchandising, a comic was released and at least one video game.