User: What is March Madness?
Assistant: March Madness is an annual Division I college basketball tournament played in the month of March.  It consists of 68 college mens basketball teams team that play in a single elimination format until a champion is crowned.  At the start of the tournament all 68 teams are ranked and divided into four regions.  The winners emerging from each of the four regions make up what is known as the Final Four.  The term 'madness' likely comes from the unpredictability of the tournament.  With so many teams playing and the single elimination format, upsets are frequent and sometimes lower seeded teams can advance quite far in the tournament.