A gamer who uses
competitive gaming (tournaments, leagues, etc.) as their sole source of income. This does not refer to someone who games
all the time and attains some level of skill; being a pro gamer means you use it as your profession, and that you
actually do earn money. In the USA, there are few pro gamers, and those that do exist usually make all of their money from prizes in tournaments and leagues, with some income coming from sponsorships. In Korea, however, there are actually leagues with paid salaries, closer in format to baseball.