In American football, rushing has two different meanings. The first is an action taken by the offensive team that means to advance the ball by running, as opposed to passing. The other is an action taken by the defensive team that means to run towards the quarterback or punt kicker across the line of scrimmage for the purpose of tackling the quarterback, or blocking or disrupting the punt or pass. Note that according to the rules in both college and professional football, tackling the quarterback after he has passed the ball is a penalty, and tackling the punt kicker is a penalty unless the kicker has mishandled the kick, moved into the player, made an attempt to run or pass, etc. (See "Kicks From Scrimmage", point #6 at http://www.supernfl.com/NFLRules.html) Defensive rushers may only block or interfere with a punt and may not touch the kicker at all. Intentionally tackling the punt kicker is considered a personal foul. United States simply as football, is a competitive team sport that is both fast-paced and strategic. ... The offensive team or offense in American football or Canadian football, is the team that begins a play from scrimmage in possession of the ball. ... In American and Canadian football, a forward pass — usually called simply a pass — is a throwing of the football from a member of the team in possession of the ball to another member of the same team who is closer to that teams goal. ... The defensive team or defense in American football or Canadian football, is the team that begins a play from scrimmage not in possession of the ball. ... The quarterback is a position in the offensive backfield of American and Canadian football, directly behind players of the line. He is generally the leader of the offensive team when it is on the field, responsible for initiating play by receiving the snap of the ball from the center. ... Todd Sauerbrun, one of the NFLs top punters, punts the ball for the Carolina Panthers. ... In American and Canadian football the line of scrimmage is the imaginary transverse line crossing the football field across its narrower dimension, which passes through the last position of the football, after the end of the most recent play and following the assessment of any penalty yards. ... Most forms of football have a move known as a tackle. ... A penalty is a punishment: a legal sentence, e. ... In basketball, a personal foul is a breach of the rules that concerns illegal personal contact with an opponent. ...
The first is an action taken by the offensive team that means to advance the ball by running, as opposed to passing.
The purpose is tackling, hurrying or flushing the quarterback, or blocking or disrupting a kick.
In both college and professional football, getting a strong passrush is an important skill, as an average quarterback will often be able to be productive, even against a strong secondary, if he has lots of time to make pass.