No ball

A ball can be a no ball for several reasons: if the bowler bowls from the wrong place; or if he straightens his elbow during the delivery; or if the bowling is dangerous; or if the ball bounces more than twice or rolls along the ground before reaching the batsman; or if the fielders are standing in illegal places. A no ball adds one run to the batting teams score, in addition to any other runs which are scored off it, and the batsman cant be dismissed off a no ball except by being run out, or by handling the ball, hitting the ball twice, or obstructing the field.