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This month the sporting calendar in the United states is dominated by one thing, March Madness.

March Madness is the culmination of the men's college basketball season - not only hugely popular with the fans, but big business too as John Converse Townsend from Basketball website "Truth About It.Net" explains.

Photo: Connor Atchley #32 of the Texas Longhorns and Martin Iti #32 of the New Mexico State Aggies vie for the loose ball during the first round of March Madness the NCAA Men's Basketball Tournament, 2007. (Credit: Jonathan Ferrey/Getty Images)