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A side arm or sidearm   is a weapon, usually a handgun but sometimes a dagger, knife or other mêlée weapon, which is worn on the body in a holster or sheath (in the case of a knife or dagger) to permit immediate access and use. A sidearm is typically required equipment for military officers and is usually carried by law enforcement personnel. Usually, uniformed personnel of these services wear their weapons openly, while plainclothes personnel have their sidearms concealed under their clothes. A sidearm may be carried alone, or as a back-up to a primary weapon such as a rifle or carbine.
Historically in western armies, and in many contemporary armies, the issue of a sidearm in the form of a service pistol is a clear sign of authority and is the mark of a commissioned officer or senior NCO. In the protocol of courtesy, the surrender of a commander's sidearm is the final act in the general surrender of a unit. If no ill will is meant, and a strict interpretation of military courtesy is applied, a surrendering commander may be allowed to keep his sidearm in order to exercise his right of command over his men. Similarly, many commanders on a local level have been anecdotally cited as having used the threat of their side arms to motivate troops, to varied effect.
The primary purpose of many side-arm weapons is to be used if the primary weapon is unavailable or if it runs out of ammunition or jams.
In a military setting, some Special Forces soldiers armed with an M-16 or M-4 assault rifle may also have a semi-automatic handgun as a side arm. Fully automatic machine pistols or PDWs are issued as personal defense side arms to paratroopers, artillery crews, helicopter crews or tank crews.
The term may also refer to swords and other mêlée weapons (e.g. the rapier, the tantō and wakizashi, the arming sword and the side-sword are all considered sidearms for their respective eras of use); the modern use of it usually pertains to pistols and similar firearms.
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