H-beams, also known as H-sections or I-beams, are structural steel beams shaped like the letter "H" when viewed from the end. They are widely used in construction and engineering due to their high strength-to-weight ratio, making them ideal for supporting heavy loads in buildings, bridges, and other structures. The design of H-beams allows for efficient distribution of weight, which enhances stability and reduces the amount of material needed. They come in various sizes and lengths, making them versatile for different applications, from residential buildings to large industrial projects.