A cargo crane, also known as a portainer crane, is a type of crane used for loading and unloading cargo from ships. The term 'cargo crane' is derived from the word 'DAVIT, ' which is a five-letter word that is commonly used to describe the crane's arm-like structure. Cargo cranes are typically mounted on a dock or pier and are used to move large containers and other heavy items from the ship to the shore. They are an essential part of the shipping industry, as they allow for efficient and safe loading and unloading of cargo.