A corner plays on the edges of the line of scrimmage and the safety plays in the middle of the field. Safeties provide more support on running plays than do cornerbacks. Cornerbacks are generally smaller and faster than safeties. Both postitions are considered defensive backs.
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The boundary corner is the corner lined up to the short side of the field. The short side of the field is the side of the field closer to the hashmarks where the ball is placed.
The field corner plays the wider side of the field.
The cornerback plays a different part of the field than the safety does. Depending on what defense is being played the two positions have separate jobs or zones to play in.