IMDb celebrates its 19th birthday
In fact, the earliest version of the technology behind the IMDb was a set of scripts for searching the USENET group rec.arts.movies. The IMDb wasn't even named yet, but it was already a work in progress on October 17, 1990.
The web site today is a bit more full featured. Not only can you get biographies for actors, directors, writers, and producers, as well as biographies, filmographies, and brief descriptions of movies, but you can also get TV listings, movie rankings, entertainment news, message boards, and the ability to watch some movies and TV shows from the site.