The NCAA 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. Teams are selected based on their performance during the regular season and conference tournaments. The tournament is divided into four regions, with each region's winner advancing to the Final Four. This event garners significant attention from fans and media, making it one of the most popular sporting events in the country.