Steven Quincy Urkel, generally known as Steve Urkel or simply Urkel, is a fictional character on the ABC/CBS sitcom Family Matters, portrayed by Jaleel White. Originally slated to have been a one-time only character on the show, he soon became its most popular character.
Steve was the epitome of a geek/nerd, with large, thick eyeglasses, "high-water" or "flood" pants held up by suspenders, multi-colored cardigan sweater, and a high-pitched voice. He professed unrequited love for neighbor Laura Winslow, perpetually annoyed her father, Carl, and tried to befriend her brother, Eddie. Amongst the rest of the family, Harriette, Rachel, and "Mother" Estelle Winslow were more accepting and caring of Urkel.
Throughout the series' run, Steve was central to many of its recurring gags, primarily gratuitous property damage and/or personal injury as a result of his inventions going awry or his outright clumsiness. He became known for several catch phrase uttered after some humorous misfortune occurred, including "I've fallen and I can't get up!" after he accidentally got drunk in one episode and fell off of the edge of a building, "Did I do that?" (previously used by Curly in the 1934 Three Stooges short Punch Drunks), "Whoa, Mama!" and "Look what you did" (if, rarely, someone else caused the damage).
White's first appearance as Steve came in the episode "Laura's First Date," the twelfth episode of the first season (though in syndication he first appears in "Rachel's First Date"), as the Winslow family's next door neighbor who Carl set up to take Laura to a junior high school dance. Though he was only intended to be a one-time only character, White was quickly promoted to recurring guest and became a full-time series regular by the end of the first season.
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Official Site: CBS
Links: Wikipedia: Steve Urkel Family Matters on TV.com Family Matters IMDb