A steel beam is a long, sturdy piece of steel used in construction to support structures like buildings and bridges. It is designed to bear heavy loads and resist bending or breaking under pressure. Steel beams come in various shapes and sizes, with the most common being the I-beam, which has a cross-section resembling the letter "I." These beams are essential in creating frameworks for large structures, providing stability and strength. They are often made from high-strength steel, which enhances their durability. The use of steel beams allows for larger open spaces in buildings, as they can span greater distances without the need for additional support.