The NCAA Division I Men’s Basketball Tournament, also known and branded as NCAA March Madness, is a single-elimination championship played each spring in the United States, 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, also was created in 1939 by the National Association of Basketball Coaches.  Played during March, it’s turned into one of the most well-known sporting events in the USA. 
The championship teams comprise winners out of 32 Division I conferences (which receive automatic bids), and 36 teams which are awarded at-large berths. These”at-large” teams have been chosen by an NCAA selection committee, then announced 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 regions and coordinated to some single-elimination”bracket”, which pre-determines, when a team wins a match, which group it will face . Each group is”seeded”, or ranked, within its area from 1 to 16. Throughout the course of three weekends, the championship occurs after the First Four, in sites across the United States. Teams, seeded by rank, proceed through a single-game elimination bracket starting with a”first four” consisting of 8 low-seeded teams playing in 4 games to get a position in the first round the Tuesday and Wednesday prior to the first round starts, a first round consisting of 64 teams playing 32 games within the course of a week, the”Sweet Sixteen” and”Elite Eight” rounds another week and weekend, respectively– and — for the last weekend of the championship — that the”Final Four” round. The Final Four is generally played during the weekend of April. These four groups, one from every area (East, South, Midwest, and West), compete at a preselected place for the national championship.
The championship has been televised since 1969.  Currently, the games are aired by CBS, TBS, TNT, and truTV under the trade-name NCAA March Madness. Since 2011, all games are available for seeing and globally. As television coverage has grown, so too has the championship’s popularity. At present, millions of Americans fill out a bracket, trying to correctly predict the results of 63 games of the championship (not including the First Four matches ).
Together with 11 titles, UCLA gets the listing for the most NCAA Men’s Division I Basketball Championships; John Wooden coached UCLA to 10 of its 11 titles. The University of Kentucky (UK) is next, with eight national titles. The University of North Carolina is third, with six titles, 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, when 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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