The keeper's significant function is to stop conveyances that pass the batsman (prevent runs being scored) but he can also attempt to expel the batsman in different ways:
The most widely recognized expulsion affected by the keeper is for him to catch a ball that has scratched the batsman's bat, called an edge before it skips. Now and then the keeper is likewise in a better position to catch a ball which has been hit high. More catches are usually taken by wicket-keepers than by other fielding positions.
- The keeper can dismiss the batsman by using the ball to hit the stumps and remove the bails if the batsman is not in his crease after a delivery.
- The keeper then will knock out the bails and if the batsman is still outside the crease then he is out.
- If a ball is hit into the outfield, the keeper needs to move closer to the stumps to catch the return throw from a fielder and then attempt to run out a batsman.
A keeper's position more often than not relies upon the bowler. For fast bowling, the keeper positions himself/herself in squats, slightly away from the stumps to be able to quickly react to edges from the batsman. For slower bowling, the keeper is nearer to the stumps to pressurise the batsman to stay within the crease to avoid getting stumped.