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 comprising 64 college basketball teams from the Division I level of the National Collegiate Athletic Association (NCAA), to ascertain the national championship. The tournament was the Notion of Ohio State coach Harold Olsen, and Was Made in 1939 by the National Association of Basketball Coaches.  Played largely during March, it has become one of the most well-known sporting events in the USA. 
The tournament teams comprise champions from 32 Division I conferences (that receive automatic bids), and 36 teams which are awarded at-large berths. 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 Selection Sunday. The 68 teams are broken up into four regions and coordinated to some single-elimination”bracket”, which pre-determines, when a team wins a game, which team it will face . Each team is”seeded”, or ranked, within its region from 1 to 16. In sites across the USA, the tournament occurs after the First Four. Teams, seeded by position, undergo a single-game removal bracket beginning with a”first four” comprising 8 low-seeded teams playing 4 games for a position in the first round the Tuesday and Wednesday before the first round begins, a first round comprising 64 teams playing 32 games over the span of a week, the”Sweet Sixteen” and”Elite Eight” rounds another weekend and week, respectively– and — for the last weekend of the tournament — the”Final Four” round. The Final Four is usually played during the weekend of April. These four teams, one from each region (East, South, Midwest, and West), compete at a preselected location for the national championship.
The tournament has been at least partially televised since 1969.  Currently, the games are aired by CBS, TBS, TNT, and truTV beneath the trade-name NCAA March Madness. Since 2011, all games can be found for viewing and globally. As television coverage has grown, so also has the popularity of the tournament. Currently, millions of Americans fill out a bracket, attempting to correctly predict the results of 63 games of the tournament (not including the First Four games).
With 11 national titles, UCLA has the record for the many NCAA Men’s Division I Basketball Championships; John Wooden coached UCLA to 10 of its 11 titles. The University of Kentucky (UK) is second, 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 with four 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 2; and Arizona, Arkansas, Indiana, Maryland, Michigan, Michigan State, Louisville[a], Syracuse, UCLA, UNLV, and Virginia have one.
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