Greaves are protective armor pieces worn on the lower legs, typically made from materials like leather or metal. They were commonly used by soldiers in ancient times, particularly in Roman and Greek armies, to shield against injuries during combat. Greaves often featured a design that allowed for mobility while providing essential protection. In modern times, greaves are less common but can still be found in certain martial arts or historical reenactments. They may also be used in some sports, where leg protection is necessary. Overall, greaves serve as a practical solution for safeguarding the lower legs in various activities.