A manhole cover is a removable plate that covers the opening of a manhole or a maintenance hole, which is a vertical access point in the ground to an underground utility vault, drainage system, or sewer system. Manhole covers are usually made of cast iron, steel, or concrete, and they come in various shapes and sizes, depending on the specific application. The primary purpose of a manhole cover is to provide access to the underground utility or drainage system for maintenance and repair purposes. The cover also serves as a protective barrier to prevent people or objects from falling into the manhole, which could result in injury or damage. Manhole covers are commonly found in urban areas, including streets, sidewalks, and parking lots, and are typically marked with a distinctive pattern or symbol to alert people to their presence. They are essential for ensuring the safe and reliable operation of underground utility systems, such as water, sewer, gas, and electrical systems. In summary, manhole covers are vital components of underground utility and drainage systems, and they play a crucial role in ensuring the safety and reliability of these systems.