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 on the field, responsible for initiating play by receiving the snap of the ball from the center. For that purpose he lines up behind the center. The quarterback is considered to be the most important postition in football.

After receiving the snap, the quarterback typically attempts to pass the ball or hand it to another player, but on occasion will attempt to advance it by running with it himself. If the quarterback is tackled behind the line of scrimmage, it is known as a sack.

That description covers the so-called "T" quarterback, meaning the quarterback in the T and formations derived from it. This is far and away the most common usage; however, not all formations have a quarterback, and in those that do, the quarterback is not necessarily positioned to take snaps.

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RT @MatthewHLeach:Question for every Heisman voter tonight: Has Colt McCoy even been the best quarterback in this GAME?
Dizfactorinc (Justin Ryan Crisler) Fri, 27 Nov 2009 10:24:59 -0000
RT @MatthewHLeach:Question for every Heisman voter tonight: Has Colt McCoy even been the best quarterback in this GAME?
Calvillo wins 3rd outstanding player award: Montreal Alouettes quarterback Anthony Calvillo was named the CFL's Mos... http://bit.ly/5TLact
cbcnewsbc (CBC British Columbia) Fri, 27 Nov 2009 09:49:37 -0000
Calvillo wins 3rd outstanding player award: Montreal Alouettes quarterback Anthony Calvillo was named the CFL's Mos... http://bit.ly/5TLact
Will the '10s be a return of Quarterback prominence? - Tampa Bay ... http://bit.ly/8MU8NM
Buccaneers_News (Tampa Bay Buccaneers) Fri, 27 Nov 2009 09:30:33 -0000
Will the '10s be a return of Quarterback prominence? - Tampa Bay ... http://bit.ly/8MU8NM
Minnesota Vikings thankful now that Jay Cutler isn't their quarterback : The Vikings probably wouldn't admit it.. http://bit.ly/6ygtWv
sportswindycity (Chicago Sports News) Fri, 27 Nov 2009 09:10:00 -0000
Minnesota Vikings thankful now that Jay Cutler isn't their quarterback : The Vikings probably wouldn't admit it.. http://bit.ly/6ygtWv
Aggies gain stature with gritty effort: ESPN It was the kind of game where Texas A&M quarterback Jerrod Joh.. http://bit.ly/4LThg9
audio_college (firescience ) Fri, 27 Nov 2009 08:50:32 -0000
Aggies gain stature with gritty effort: ESPN It was the kind of game where Texas A&M quarterback Jerrod Joh.. http://bit.ly/4LThg9
Minnesota Vikings thankful now that Jay Cutler isn't their quarterback : The Vikings probably .. http://bit.ly/7jmT8Y (per Fox Sports)
vikingshub (Vikings Hub) Fri, 27 Nov 2009 08:50:27 -0000
Minnesota Vikings thankful now that Jay Cutler isn't their quarterback : The Vikings probably .. http://bit.ly/7jmT8Y (per Fox Sports)

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