A beam is a structural element that primarily resists bending and is used to support loads in construction. It is typically horizontal and can be made from various materials, including wood, steel, or concrete. Beams are essential in buildings, bridges, and other structures, as they help distribute weight and provide stability. In engineering, beams are classified based on their support conditions, such as simply supported, cantilever, or fixed. The design of a beam considers factors like load type, span length, and material properties to ensure safety and performance. Properly designed beams are crucial for the integrity of any structure.