👉 Casing, also known as a casing or casings, is a type of metal used in construction and engineering for protecting pipes, cables, and other types of electrical wiring from corrosion. It is typically made up of a layer of steel that is coated with a protective layer of paint or another material to prevent rusting. The term "casing" can also be applied to the entire structure or part thereof, including pipe connections, conduit, insulation, and other components used in the construction process.