Steel is an alloy primarily composed of iron and carbon, along with small amounts of other elements like manganese, chromium, or nickel. It is known for its strength, durability, and versatility, making it one of the most widely used materials in construction, manufacturing, and transportation. Steel is used in structures like buildings, bridges, and railways, as well as in products such as tools, appliances, and machinery. Depending on the composition and treatment, steel can be made to be corrosion-resistant, heat-resistant, or flexible, meeting a variety of specific needs in different industries.