🔍 An i-beam is a structural steel beam that has the shape of the letter "I." It is commonly used in construction and engineering to provide support and strength to buildings, bridges, and other structures. The horizontal top and bottom flanges of the i-beam provide resistance against bending, while the vertical web in the middle helps distribute the load evenly. The design of the i-beam allows it to carry heavy loads over long spans, making it a popular choice in various construction projects.