청동기, or the Bronze Age, is a historical period characterized by the use of bronze for tools and weapons. This era marked significant advancements in technology and culture, as societies began to develop more complex social structures and trade networks. The use of bronze, an alloy of copper and tin, allowed for stronger and more durable implements compared to those made of stone. During the 청동기 period, various civilizations, including the 고조선 in Korea, flourished. Artifacts such as 청동기 tools, weapons, and ceremonial items provide insight into the daily lives and beliefs of these ancient peoples. The period laid the foundation for further advancements in metallurgy and societal organization.