Concrete beams are structural elements made from a mixture of cement, water, and aggregates. They are designed to support loads and span distances, making them essential in buildings, bridges, and other constructions. The strength of concrete beams comes from their ability to withstand compression, while reinforcement, often with steel bars, helps them resist tension. These beams can be precast or poured in place, depending on the construction requirements. Common types include reinforced concrete beams and prestressed concrete beams, each serving specific purposes. Proper design and placement are crucial for ensuring the safety and durability of structures that utilize concrete beams.