NBC Sports is a channel in the NBC family that exclusively covers all realms of the sporting world. They provide analysis and reporting on a variety of sports and important games. NBC Sports also likes to take a unique approach to a few specific leagues by airing exclusive, special games with a twist. For example, NBC Sports is large broadcasting partner of the NHL and they will show a few games a week that typically have national interest.
One of the most popular broadcasts on NHL Network is the "NHL Rivalry Night" which typically takes place on Wednesdays. When two teams match-up that have a deep history or are considered rivals by the fans, they will air these games as they gather peak interest from hockey fans all over the country. They will also show double-headers if there is an East coast game starting around 7 PM (Eastern Time) and another starting around 10 PM. In addition to hockey, they provide coverage on other sports as well.
NBC Sports tends to cover some sports that do not get as much coverage on other outlets like Formula 1 racing and European soccer leagues. They do the mainstream sports coverage during the NFL and NBA seasons but they gather some interest from fans of the "odd-ball" sports as well. While they do have special sports that they cover, NBC Sports makes a strong effort to show sports from all over the globe and provides air time to sports that may not get as much from national TV outlets.