青铜 (qīngtóng), or bronze, is an alloy primarily made of copper and tin. It was widely used in ancient civilizations for making tools, weapons, and decorative items due to its strength and resistance to corrosion. The use of bronze marked a significant technological advancement, known as the Bronze Age, which began around 3300 BCE in some regions. Bronze is also notable for its role in art and culture. Many famous artifacts, such as bronze statues and ceremonial vessels, were created during this period. The development of bronze metallurgy influenced trade and warfare, shaping the course of history in various societies around the world.