In modernlanguage, a missile is a self -propelled system, as opposed to an unguided self -propelled munition, referred to as a rocket (although these too can also be guided). Missiles have four system components: targeting or missile guidance, flight system, engine, and warhead. Missiles come in types adapted for different purposes: surface-to-surface and air -to-surface missiles (ballistic, cruise, anti- ship, anti- tank, etc.), surface-to- air missiles (and anti-ballistic), air -to- air missiles, and anti- satellite weapons. All known existing missiles are designed to be propelled during powered flight by chemical reactions inside a rocketengine, jet engine, or other type of engine. Non- self -propelled airborne explosive devices are generally referred to as shells and usually have a shorter range than missiles.
In ordinary British-English usage predating guided weapons, a missile is such as objects thrown at players by rowdy spectators at a sporting event.
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