A missile, or guided missile, is a self-propelled guided weapon system, as opposed to an unguided self-propelled munition, referred to as just a rocket. Missiles have four system components: targeting and/or 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 (anti-aircraft and anti-ballistic), air-to-air missiles, and anti-satellite missiles. All known existing missiles are designed to be propelled during powered flight by chemical reactions inside a rocket engine, jet engine, or other type of engine.[citation needed] Non-self-propelled airborne explosive devices are generally referred to asshells and usually have a shorter range than missiles.
An ordinary English-language usage predating guided weapons, a missile is "any thrown object", such as objects thrown at players by rowdy spectators at a sporting event.
- A powered, guided munition that travels through the air or space is known as a missile (or guided missile.)
- A powered, unguided munition is known as a rocket.
- Unpowered munitions not fired from a gun are called bombs whether guided or not; unpowered, guided munitions are known as guided bombs or "smart bombs".
- Munitions that are fired from a gun are known as projectiles whether guided or not. If explosive they are known more specifically as shells or mortar bombs.
- A Powered munitions that travel through water are called torpedoes (an older usage includes fixed torpedoes, which might today be called mines).
- Hand grenades are not usually classed as missile
- Guided missiles have a number of different system components:
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