College Basketball is the premier form of non-professional basketball in the United States. Men's and Women's teams representing College athletic programs across the country compete from November to April. The culmination of these competitions is the NCAA Tournament known as March Madness, which is a single-elimination tournament held in March-April of every year. This tournament is one of the biggest annual sporting events in the United States. College Basketball schedules are often announced in September, although NCAA Tournament seedings are not confirmed until the days before it begins. Historically, the most popular teams in College Basketball include Duke Blue Devils, UCLA Bruins, North Carolina Tar Heels and Kentucky Wildcats.