Molybdenum is a chemical element with the symbol Mo and atomic number 42. It is a silvery-white metal known for its high melting point and strength. Molybdenum is primarily used in steelmaking to enhance the strength and durability of steel alloys, making it essential in construction and manufacturing. This element is also important in various industrial applications, including electrical contacts and filaments. Additionally, molybdenum plays a crucial role in biological systems, as it is a trace element necessary for certain enzymes in plants and animals, contributing to processes like nitrogen fixation.