Defensive schemes in sports, particularly in football, refer to the strategies and formations used by a team to prevent the opposing team from scoring. These schemes are designed to counteract the offensive plays of the opponent, utilizing various player alignments and tactics to create pressure, cover receivers, and stop runs. Common defensive schemes include the 4-3 defense and the 3-4 defense, which indicate the number of defensive linemen and linebackers on the field. In addition to formations, defensive schemes also involve specific roles for players, such as cornerbacks and safeties, who focus on pass coverage, while linebackers may be tasked with stopping the run or covering short passes. Coaches analyze the strengths and weaknesses of both their team and the opponent to develop effective defensive strategies that can adapt to different game situations.