Simplify the following text for a Grade 13 native English-speaking person.
Original: The NCAA Men 's Division I Basketball Championship is a single-elimination tournament held each spring in the United States , featuring 68 college basketball teams , to determine the national championship in the top tier of college basketball .
Simplified: The NCAA Men 's Division I Basketball Championship , or NCAA Tournament is a single-elimination ( if you lose a game , you stop playing ) college basketball tournament with 68 college teams playing each other .