In cricket, a players' batting average is the total number of runs they have scored divided by the number of times they have been out, usually given to two decimal places. Since the number of runs a player scores and how often they get out are primarily measures of their own playing ability, and largely independent of their teammates, batting average is a good metric for an individual player's skill as a batter. The number is also simple to interpret intuitively. If all the batter's innings were completed, this is the average number of runs they score per innings. If they did not complete all their innings, this number is an estimate of the unknown average number of runs they score per innings.

In cricket, a dismissal occurs when a batter's innings is brought to an end by the opposing team. Other terms used are the batter being out, the batting side losing a wicket, and the fielding side taking a wicket. The ball becomes dead, and the dismissed batter must leave the field of play for the rest of their team's innings, to be replaced by a team-mate. A team's innings ends if ten of the eleven team members are dismissed. Players bat in pairs so, when only one batter remains who can be not out, it is not possible for the team to bat any longer. This is known as dismissing or bowling out the batting team, who are said to be all out.