description：NCAA (National Collegiate Athletic Association), the National Collegiate Athletic Association, is an association formed by thousands of colleges and universities in the United States. Its main activities are various sports leagues held every year, among which the basketball league in the first half of the year and the rugby league in the second half of the year attract the most attention. In the NCAA, more than a thousand four-year universities in the United States and Canada are divided into three levels and dozens of leagues for football, basketball, baseball, ice hockey and other ball leagues, as well as track and field, gymnastics, wrestling and other events. The NCAA tournament is one of the most important events for American college students after studying.