A sidearm is an individual-served weapon that is kept at one's side and can be rapidly accessed if needed. A sidearm may be carried alone or as an ancillary weapon to a more frequently-used primary weapon. The term historically referred to swords, daggers, and similar small weapons kept at one's side in a sheath, and in modern combat dominated by guns, sidearms are often defined as handguns that are similarly kept in a holster.