Alf is a fictional character from the American television sitcom that aired from 1986 to 1990. He is an alien from the planet Melmac who crash-lands on Earth and is taken in by the Tanner family. Alf is known for his humorous personality, love of eating cats, and his desire to return to his home planet. The show combines elements of comedy and science fiction, featuring Alf's interactions with the Tanner family and their attempts to keep his existence a secret from the outside world. The character became popular for his witty remarks and unique perspective on human life.