The NCAA Division I Men’s Basketball Tournament, also branded and known as NCAA March Madness, is a single-elimination tournament played each spring in the USA, now featuring 64 college basketball teams in the Division I level of the National Collegiate Athletic Association (NCAA), to ascertain the national championship. The tournament was the idea of Ohio State coach Harold Olsen, and was created in 1939 from the National Association of Basketball Coaches.  Played largely during March, it has become one of the most famous annual sporting events in the USA. 
The tournament teams include champions from 32 Division I conferences (which get automatic bids), and 36 teams that are awarded at-large berths. All these”at-large” teams are picked by an NCAA selection committee, then declared in a nationally televised event on the Sunday preceding the”First Four” play-in matches, now held in Dayton, Ohio, and dubbed Choice Sunday. Even the 68 teams are divided into four areas and coordinated to some single-elimination”bracket”, which pre-determines, when a team wins a match, which team it will face . Each team is”seeded”, or rated, within its area from 1 to 16. In sites across the USA, the championship happens Following the First Four. Teams, seeded by position, proceed through a single-game removal bracket starting with a”first four” consisting of 8 low-seeded teams playing in 4 matches to get a position in the initial round the Tuesday and Wednesday before the first round begins, a first round consisting of 64 teams playing in 32 games within the course of a week, the”Sweet Sixteen” and”Elite Eight” rounds another week and weekend, respectively, and — to the final weekend of the championship — that the”Final Four” round. The Final Four is generally played during the first weekend of April. These four teams, one from every region (East, South, Midwest, and West), compete in a preselected location for the national championship.
The tournament has been televised since 1969.  Currently, the matches are aired by CBS, TBS, TNT, and truTV beneath the trade-name NCAA March Madness. Since 2011, all games are available for viewing nationwide and globally. As television coverage has grown, so also has the tournament’s popularity. At present, millions of Americans fill out a bracket, attempting to correctly predict the outcome of 63 games of the tournament (not including the First Four games).
Together with 11 national titles, UCLA gets the record for the many NCAA Men’s Division I Basketball Championships; John Wooden coached UCLA to 10 of its 11 names. The University of Kentucky (UK) is next, with eight national titles. The University of North Carolina is third and Indiana University and Duke University are tied for fourth with five titles. The University of Connecticut is sixth with four national titles. The University of Kansas (KU) & Villanova are tied for 7th with three national titles. Since 1985, once the tournament expanded to 64 teams, Duke has won five championships; North Carolina and UConn have won four; Kentucky & Villanova have three; Kansas & Florida have two; and Arizona, Arkansas, Indiana, Maryland, Michigan, Michigan State, Louisville[a], Syracuse, UCLA, UNLV, and Virginia have you.
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