A sergeant is a rank in the military and law enforcement, typically above a corporal and below a lieutenant. Sergeants are responsible for leading and supervising a group of soldiers or officers, ensuring that tasks are completed effectively. They often serve as a link between higher-ranking officials and the personnel they oversee. In the military, sergeants may specialize in various fields, such as infantry or logistics, and are crucial for training new recruits. In law enforcement, sergeants often oversee patrol officers and manage daily operations within a police department, ensuring that policies and procedures are followed.