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Defensive back (DB) is a player in American football whose role is primarily pass coverage; that is, the defensive back will stay near a receiver and try to deflect or intercept any passes thrown to him. However, like all defensive players, a DB can rush the quarterback and tackle running backs. Collectively, DBs are called the secondary.
A typical defensive set will have four DBs — two cornerbacks, a free safety, and a strong safety.
The cornerbacks position themselves at the line of scrimmage, directly opposite the wide receivers. They attempt to disrupt the receivers' routes and defend against short passes.
The free safety is often the fastest player on the defense. He is positioned 10 to 15 yards behind the line of scrimmage, toward the center of the field. He provides the last line of defense against running backs and receivers who get past the linebackers and cornerbacks.
The strong safety is usually larger than the free safety and is positioned relatively close to the line of scrimmage. He is often an integral part of the run defense.
If the defense expects a pass, they may replace one or two of the linebackers with additional defensive backs. The fifth DB is called the nickel back, and the sixth is called the dime back.
Statistics for DBs include interceptions, tackles, and deflected passes.
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