Stainless steel is an alloy primarily made of iron, carbon, and at least 10.5% chromium, which gives it its corrosion-resistant properties. The addition of chromium forms a protective oxide layer on the surface, making it resistant to rust and staining. Other elements like nickel, molybdenum, and manganese may be added to enhance its strength, durability, or resistance to extreme temperatures. Stainless steel is widely used in construction, kitchenware, medical instruments, automotive parts, and industrial equipment due to its strength, aesthetic appeal, and low maintenance requirements.