Play-by-play, in broadcasting, is a North American term and means the reporting of a sporting event with a voiceover describing the details of the action of the game in progress. In North America, in many sports, the play-by-play person is assisted by a color commentator, and sometimes a sideline reporter. Nearly all professional sports teams and most collegiate teams have their own play-by-play announcers, … Wikipedia
The definitive Wikipedia entry for Play-By-Play. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Play-by-play