The University of Illinois at Urbana–Champaign (U of I, UIUC, or simply Illinois) is a public research-intensive university in the state of Illinois, United States. It is the oldest, largest, and most prestigious campus in the University of Illinois system. U of I's Division of Intercollegiate Athletics fields teams for ten men's and eleven women's varsity sports. The university participates in the NCAA's Division 1. The university's athletic teams are known as the Fighting Illini. The university operates a number of athletic facilities, including Memorial Stadium for football, the Assembly Hall for men's and women's basketball, and the Atkins Tennis Center for men's and women's tennis.