Quarterback: Generally the person who passes the ball. He calls the cadance and tells the Center when to snap the ball. He is generally the offensive leader (if not the whole team-leader), and is brilliant with the offense as a whole. When the offense is about to run a play that'll lead to crap, he audibles to a better play to run.
Halfback: Runs the ball. He's generally small, quick, and agile. Although can also be large and strong. He's usually either the most elusive or the most powerful runner on the team, and he has the second-best field vision (next to the quarterback). When the quarterback is having a bad day, or the pass defense of the other team is good, you generally let your running back run the ball and pull the load. He carries the ball better than everyone else on the team, and he generally gets tackled the most. He takes hits the best most of the time too.
Fullback: Doesn't get what you would call "great" playing time. He generally comes in with the halfback in any two-back sets, and usually serves as an impact blocker. In the rare occasion that he runs the ball, it usually for short yardage or on the goalline. On pass plays, if he's not serving as the man who picks up the blitz or is providing extra pass blocking, he normally runs a flare or into the flats.
Offensive Lineman: The people who make the holes for the runningbacks and block for the quarterback. They do the dirty work and don't have the longest of careers. Naturally the biggest men on the field. A NFL O-Lineman under 300lbs is considered small.
Center: An offensive lineman who snaps the ball. He has the most difficult job of the offensive linemen.
Wide Receiver: Runs routes, usually downfield. They're usually featherlite and very fast, and have soft hands that allow them to catch the ball. They're meant to be the fastest and most agile people on the field, as they usually can leap more than three feet.
Tight End: The hybrid between a receiver and offensive lineman. He usually runs simple routes, and is a safe bet for usually breaking the first tackle.
Devensive End: Keeps outside contain, normally is the fastest defensive lineman and is the main pass rusher.
Defensive Tackle: The big uglies on the D-Line. Incredibly big and strong, normally the main runstoppers.
Middle Linebacker: Usually the hardest hitter on the defense. They are used in blitzes to stop the run, and are brutal and relentless. They usaually cover the tight ends and backs in man coverage and play over the middle in zone. If he gets his hands on the unsuspecting fast moving player, they are toast.
Outside Linebackers: They play outside pass coverage and cover the backs and tight end in man coverage. They are quicker, lighter hitting linebackers who bring the outside pressure on the blitz, normally pass blitzes.
Cornerbacks: Very fast, smallest devensive guys. They cover the the receivers generally. When they come on the blitz its either a long gain for the offense or a long loss. Basically they're receivers with harder hands and stronger legs.
Strong Safety: A hard hitting corner that's slower. A fast linebacker that couldn't hit hard enough.
Free safety: A faster, softer hitting strong safety. An outside linebacker that couldn't hit hard enough.
Source: http://www.cooperspick.com/fullarticle.asp?423-Football-Positions *slightly modified
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