Structural steel is a category of steel used for making construction materials in a variety of shapes. It is known for its high strength-to-weight ratio, making it ideal for building frameworks, bridges, and other structures. Common shapes include beams, columns, and plates, which can be easily fabricated and assembled. This type of steel is typically made from iron and carbon, and it can be further alloyed with other elements to enhance its properties. Structural steel is widely used in the construction industry due to its durability, versatility, and ability to withstand heavy loads and harsh environmental conditions.