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In the sport of cricket, an extra is a run scored by a means other than a batsman hitting the ball. Extras are also sometimes called sundries. Extras are added to the batting team's score, but are not added to any individual batsman's score.
Other than runs scored off the bat from a no ball, a batsman is not given credit for extras and the extras are tallied separately on the scorecard.
An umpire may call a no ball when the bowler, wicket-keeper, or fielder commits an illegal action during bowling.
The most common reason for a no ball is overstepping the popping crease for the front foot at the instant of delivery. A rarer reason is when the bowler's back foot touches or lands outside the return crease. A third reason for calling a no ball is when a bowler throws (or chucks) the ball. This has caused a lot of international controversy in recent times. The penalty for a no ball is one run; furthermore, the no ball does not count as one of the six in an over but it counts as a ball faced by the batsman as far as his personal statistics are concerned. The runs otherwise scored by the batsman, whether by running or by a boundary, also count as part of the team score, but only runs scored off the bat are included in the batsman's score.
See no ball for a complete list of no ball situations.
A ball being delivered too far from the batsman to strike it, provided that no part of the batsman's body or equipment touches the ball, is known as a wide (the definition of what counts as wide is far more strict in a limited overs match, because bowling unplayable balls would be a way to "waste" the batting team's innings).
A wide is penalized one run; a wide also does not count as one of the six in an over. However, if a no ball is called, the ball is not also counted as a wide. The runs otherwise scored by the batsman, whether by running or by a boundary, also count as part of the score. (Note that the batsman need not strike the ball to run.)
If the ball passes the batsmen, but is not wide, and the wicketkeeper still cannot stop the ball, the batsmen may run. In this case, the runs are scored as byes.
If the ball hits the batsman's body, the batsman is not out leg before wicket, and the batsman either tried to avoid being hit or tried to hit the ball with the bat, the batsman may run. In this case, regardless of the part of anatomy touched by the ball, the runs scored are known as leg byes.
Rarely, extra "penalty" runs may be scored.