The Fourth Engineer is an entry-level position on a ship, responsible for assisting in the operation and maintenance of the vessel's machinery. This role typically involves monitoring equipment, performing routine checks, and helping with repairs under the supervision of senior engineers. Fourth Engineers often work in the engine room, where they learn about various systems, including steam boilers, fuel oil systems, and cooling systems. This position is crucial for gaining practical experience and advancing to higher engineering ranks, such as Third Engineer or Second Engineer.