The rear of a ship, technically speaking, is called the stern. This term is used to designate the aft-most section of a vessel that is used for steering, navigation, transmission, and propulsion. The stern of a ship is usually quite distinctive, owing to its specific configuration and design. Typically, the stern will feature a rudder, which is used for steering the vessel, as well as a propeller or water-jet system for propulsion. In addition to these essential elements, the stern of a ship may also have other features, such as the ship’s name, flags and pennants, lights, and other signaling devices. Depending on the size and type of the vessel, the stern may also house a crew’s quarters, storage areas, or other facilities.

Source: Boating World