Steel is an alloy primarily composed of iron and carbon (typically under 2%). This versatile material dominates construction, manufacturing, and transportation industries due to its exceptional strength-to-weight ratio, durability, and recyclability. Modern steel production involves blast furnaces or electric arc furnaces, with China being the world's largest producer. From skyscrapers to surgical tools, steel's adaptability through different grades (like stainless or carbon steel) makes it indispensable in our daily lives.