A troop is a military sub-subunit, originally a small formation of cavalry, subordinate to a squadron. In many armies, a troop is the equivalent element to the infantry section or platoon. Troops are soldiers, especially when they are in a large organized group doing a particular task. Here are some key points about troops in the army:

• A troop is a squad or team of soldiers.
• Troops can refer to members of the military collectively, as in "the troops".
• Troops can also refer to the other members of ones company or cause, but because of its military connotations, it conveys a particularly altruistic type of dedicated worker.
• In the Australian Army, a troop is the equivalent of a platoon sized element in units of certain corps.
• In the Royal Marines, a troop is the equivalent to an Army platoon.
• In the Canadian Army, a troop is the equivalent of a platoon within the armoured, artillery, engineer, and signals branches.
• In the United States Army, a troop is a sub-unit of cavalry, armor, or air cavalry.

Troops are often used to refer to soldiers in a military, and it is more common to see its plural, troops.