3-4 defense in American football refers to a defensive alignment with three defensive linemen and four linebackers. The secondary includes two cornerbacks and two safeties. This term matters because it creates flexibility and disguises pressure. Offenses struggle to predict who will rush the quarterback.
Teams use the 3-4 defense to vary blitz angles and coverage looks. Linebackers may rush or drop back after the snap. Defensive linemen focus on controlling blockers. For example, a linebacker rushes from the edge while another drops into coverage.
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