A mezzanine is an intermediate floor or platform that is built between the main floors of a building. It is often used to create additional space without the need for a full additional floor. Mezzanines are commonly found in commercial buildings, warehouses, and theaters, providing areas for storage, seating, or office space. Typically, a mezzanine is open to the floor below and may have railings for safety. They can be constructed from various materials, including steel, wood, or concrete, and are designed to be easily accessible via stairs or lifts.