The NCAA Men's Basketball Tournament, also known as "March Madness," is an annual college basketball competition held in the United States. It features 68 teams from various colleges and universities, competing in a single-elimination format to determine the national champion. The tournament typically takes place in March and April, culminating in the championship game. The tournament is divided into four regions, with teams seeded based on their performance during the regular season and conference tournaments. Fans often fill out brackets predicting the outcomes of each game, adding to the excitement and engagement surrounding this popular sporting event.