The featured ball carrier among the two running backs lined up behind the quarterback. Generally, the halfback is the fastest member of the backfield and can also catch passes to pose a double threat to defenders.
Also refered to as Tailback or Runningback. A member of the offense, whose job it is to run the ball, receive passes, and block for a teammate running the ball. The name derives from the fact that in an I formation the Halfback is half way between the Quarterback and the Fullback, or half the way back. See Quarterback and Fullback to further clarify.