An "I-Beam" is a structural steel beam shaped like the letter "I" when viewed in cross-section. It consists of a horizontal top and bottom flange connected by a vertical web. This design allows the beam to efficiently support heavy loads while minimizing material use, making it a popular choice in construction and engineering. I-Beams are commonly used in the construction of buildings, bridges, and other structures. Their strength and stability make them ideal for supporting floors, roofs, and other components. The use of steel in I-Beams also contributes to their durability and resistance to bending and twisting.