청동, or "bronze," is an alloy primarily made of copper and tin. It has been used for thousands of years to create tools, weapons, and decorative items. The addition of tin to copper improves its strength and resistance to corrosion, making bronze a valuable material in ancient civilizations. The use of 청동 marked significant advancements in technology and art, particularly during the Bronze Age. Artifacts made from bronze, such as sculptures and coins, provide insight into the cultures that produced them. Today, bronze continues to be used in various applications, including musical instruments and architectural elements.