The NCAA Division I Men's Basketball Championship, often referred to as "March Madness," is an annual college basketball tournament held in the United States. It features 68 teams 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 event is organized by the National Collegiate Athletic Association (NCAA) and showcases the top college basketball programs across the country. It attracts significant media attention and fan engagement, making it one of the most popular sporting events in the U.S. each year.