The National Association of Intercollegiate Athletics (NAIA) is, like the NCAA, an American university sports association. 250 universities are covered by the NAIA.
Compared to the NCAA, there are fewer scholarships to be distributed and the sport level is lower. Nevertheless, there are certainly universities that have at least as good, or even better, teams than the NCAA Division 1, 2 & 3 universities. A NAIA university does not therefore provide less opportunities for athletes to develop optimally.