The term "second-in-command" refers to an individual who holds a position just below the leader in an organization or group. This person often assists the leader in decision-making and may take charge in the leader's absence. The second-in-command is crucial for maintaining continuity and ensuring that operations run smoothly. In many contexts, such as in businesses or military units, the second-in-command may be referred to as the deputy, vice president, or lieutenant. Their responsibilities can include managing teams, overseeing projects, and implementing strategies set by the leader, making them an essential part of the leadership structure.