Soccer games are (or should be) split into two halves: the first and second halves. In games like football and hockey, which are played in quarters or thirds, the term "period" is employed. But in soccer, the original game, each half was once called a "period". The first and second halves of a soccer match are also called legs. So, a match is divided into two legs. A full match is three or more legs. If there is a third goal after two periods, they are called extra periods. If not, it's called a tie. Some people call every period of the game a round, but that's incorrect. A round is one part of a soccer match; a period is just one chunk of time during which play occurs. A round consists of two periods - so it's correct to say that a round is two balls being kicked around until someone scores. A single period may consist of several minutes of play or only have enough time for a few shots to be taken - this depends on what kind of game is being played. There are also breaks between rounds known as halts. There are two types of halts: one when the ball is out of play for any reason other than injury (this includes if the referee stops the game for any reason), and another at the end of a period.