Boxing is a combat sport involving two opponents who throw punches at each other within a regulated match. It can be practiced professionally or at the amateur level, including in the Olympics. Some famous professional boxers mentioned include Jack Dempsey, Wladimir Klitschko, and Oleksandr Usyk. Klitschko and Usyk both had successful amateur careers before becoming champions in the professional realm. The Ukrainian national boxing team, called the Ukraine Otamans, has also found success representing their country in international competitions like the World Series of Boxing.