Definition - What does Casting mean?
Casting is a manufacturing process used by the forging industry to produce an object (often metal) of a specific desired shape. This is achieved by pouring hot molten metal into a mold that contains a hollow cavity of the exact required shape. The molten liquid metal flows through the mold and settles into the hollow cavity. As the metal solidifies it acquires the shape of the hollow cavity. The solidified metal piece is then removed from the mold without breaking to complete the casting process.
Corrosionpedia explains Casting
Casting is one of the oldest manufacturing processes used by many manufacturing industries. Casting is a simple and cost effective solution to achieve a desired shape for a metal (or other material) piece. The metal shapes that are produced by the casting process may be complex designs that would otherwise require a high technological investment cost if the same complex shape had to be rendered through any other process.