There are different college divisions because there are various associations for college sports. The two major ones are the NCAA (National Collegiate Athletic Association) and the NAIA (National Association of Intercollegiate Athletics). There are three NCAA divisions (D1, D2, and D3) and NAIA division 1 and Division 2. There is also NJCAA (National Junior College Athletic Association), which oversees athletics on community colleges and junior colleges in the US.