Plate armor is a type of protective clothing made from large metal plates. It was commonly used by knights and soldiers during the Middle Ages to defend against weapons like swords and arrows. The plates were often shaped to fit the body and were connected with straps or hinges, allowing for better movement while providing strong protection. This armor was typically made from materials like steel or iron and could cover various parts of the body, including the chest, arms, and legs. Knights wore plate armor during battles and tournaments, making them formidable opponents on the battlefield.