The no-huddle offense is usually employed as part of a hurry-up offense, but it is not necessarily an attempt to snap the ball (begin the play) quicker. Rather, the lack of huddle allows the offense to threaten to snap the ball quickly, denying the defending team time to substitute players and communicate effectively between coaches and players. When operating in the no-huddle, the offense typically lines up in a predetermined formation at scrimmage, possibly with a predetermined play in mind. The quarterback may then call an audible, altering the play call based on a perceived weakness in the defense's response. Some teams use this methodology to react to the defense and will remain at this pre-snap state for a considerable time as the clock runs down, providing a stream of actual and counterfeit play changes.
Read more about this topic: Hurry-up Offense