Innings in baseball are used as a measurement of points and time during a baseball game. Most baseball games consist of nine innings, and each of those innings are split into two halves. The top half and the bottom half. With each half, the teams are able to swap, giving the defense a chance to play offense and the offense to play as defense. The halves swap once a team has been awarded three outs.
Given the nature of baseball, sometimes the nine innings will lead to a draw. In cases like this, more innings are often advised as a way to produce a clear winner. Extra innings can be added onto the end of a live game or carried over to a rescheduled game. Extra innings end once the away team has more runs during their half or until the home team completes a game winning run. This means that games can, in theory, continue indefinitely until a clear winner is apparent.