High-strength low-alloy steel (HSLA) is a type of steel designed to provide better mechanical properties and greater resistance to corrosion than conventional carbon steel. It contains small amounts of alloying elements, such as manganese, chromium, and nickel, which enhance its strength and toughness without significantly increasing weight. These steels are commonly used in construction, automotive, and manufacturing industries due to their excellent weldability and formability. HSLA is often preferred for applications requiring high strength-to-weight ratios, such as in bridges, vehicles, and heavy machinery, making it a versatile material in modern engineering.