Seinfeld used to be a television program.
The National Broadcasting Company ( NBC ) is an American English language commercial broadcast television network that is a flagship property of NBCUniversal , a subsidiary of Comcast . Seinfeld is an American sitcom that originally ran for nine seasons on NBC , from 1989 to 1998 . Seinfeld is widely considered to be one of the greatest and most influential sitcoms ever made . Sitcom . Sitcoms originated in radio , but today are found mostly on television as one of its dominant narrative forms .