NCAA Men's College BB

There are 6 major conferences and 11 mid-major conferences:

'Big 6' Major Conferences:

• Atlantic Coast Conference (ACC)
  
• Big East
  
• Big Ten
  
• Big Twelve
  
• Pac 10
  
• Southeastern Conference (SEC)

Additionally, Gonzaga (WCC) and Memphis (USA) can be considered major programs within non-major conferences.
Mid-Major Conferences:

• Atlantic 10 Conference
  
• Colonial Athletic Association
  
• Conference USA
  
• Horizon League
  
• Mid-American Conference
  
• Missouri Valley Conference
  
• Mountain West Conference
  
• Western Athletic Conference
  
• West Coast Conference

NCAA Men's Division 1 Basketball Championship - March Madness

• Began in 1939 (Phog Allen at the University of Kansas)
  
• Consists of 65 teams
  
• Composed of conference champions from each Division 1 conference, plus 'at large' bids voted in by the NCAA selection committee
  
• 31 division 1 conferences, 34 'at-large' bids
  
• Selection process and seedings are determined by team rankings, win/loss records and rpi data
  
• 'Play-in' game is the first game of the tournament and determines who will fill out the 64th spot in the overall tournament bracket

*Info obtained from wikipedia: College Basketball, NCAA Men's Division 1 Basketball Championship