The NCAA Division I men's basketball tournament is a single-elimination tournament for men's college basketball teams in the United States. It determines the champion of Division I, the top level of play in the National Collegiate Athletic Association (NCAA), and the media often describes the winner as the national champion of college basketball. The NCAA tournament has been held annually since 1939, except for 2020, when it was canceled because of the COVID-19 pandemic in the U.S. Its field grew from eight teams in the beginning to sixty-five teams by 2001; as of 2011, sixty-eight teams take part in the tournament. Teams can gain invitations by winning a conference championship or receiving an at-large bid from a 10-person committee. The semifinals of the tournament are known as the Final Four and are held in a different city each year, along with the championship game; Indianapolis, the city where the NCAA is based, will host the Final Four every five years until 2040. Each winning university receives a rectangular, gold-plated trophy made of wood.