What is March Madness: The NCAA tournament explained

Here is everything (really!) you might want to know about March Madness — one of the biggest, most exciting and most fun events in sports. Also known as the NCAA Division I men's basketball tournament, it's been played annually since 1939.

source https://www.ncaa.com/news/basketball-men/bracketiq/2020-04-20/what-march-madness-ncaa-tournament-explained