What is a tourniquet used for?

A tourniquet is a device used in emergency situations to temporarily restrict blood flow to an injured limb. It is typically made from a piece of cloth, rope, or rubber that is wrapped tightly around the limb and tied in place. Tourniquets are used to control severe bleeding and can save lives when used correctly. However, they should only be used as a last resort, as they can also cause damage to the limb if used incorrectly.