Boxing, also called pugilism, is a combat sport
Combat sport
A Combat sport, also known as a Fighting sport, is a competitive contact sport where two combatants fight against each other using certain rules of engagement , typically with the aim of simulating parts of real hand to hand combat...

 in which two people fight
Combat, or fighting, is a purposeful violent conflict meant to establish dominance over the opposition, or to terminate the opposition forever, or drive the opposition away from a location where it is not wanted or needed....

 each other using their fists. Boxing is supervised by a referee
Referee (boxing)
The referee in the boxing is the individual charged with enforcing the rules of that sport during a match.-The role of the referee:Referees have the following roles:*Gives instructions to both boxers before the fight...

 over a series of between one to three minute intervals called rounds. The boxers are generally continue (a Technical Knockout, or TKO), if an opponent is disqualified for breaking a rule, or a winner is determined either by the referee's decision or by judges' scorecards at the end of the bout.

Boxing is a lot of white men watching two black men beat each other up.

Muhammad Ali, attributed in Chambers Sporting Quotations‎ (1990), by Simon James, p. 27

Champions aren't made in gyms, champions are made from something they have deep inside them — a desire, a dream, a vision. They have to have last-minute stamina, they have to be a little faster, they have to have the skill and the will. But the will must be stronger than the skill.

Muhammad Ali, in Talent Is Never Enough : Discover the Choices That Will Take You Beyond Your Talent (2007) by John C. Maxwell, p. 141

BOXING: A mutual infliction of brain damage for the amusement of the public.

Rick Bayan|Rick Bayan, The Cynic's Dictionary

You know, I cut easily, so I don’t think I would’ve won the title, but I would’ve been a contender.

Roger Donahue, American boxer. As quoted by Budd Schulberg|Budd Shulberg in his interview for The Times (UK) newspaper, 19th January 2009