Marine machinery is a type of diesel engine. It is defined as energy machines. Ship engines such as diesel engines are a kind of internal combustion engine. It absorbs the energy contained in the ship's fuel and converts it into mechanical energy. For ships, which are the most important means of transportation, machinery is very important.

Ship machines, ie engines, according to where the fuel is burned, according to the number of cylinders in the engine, according to the working principle is divided into different groups. One of these groups is preferred according to the ship size and usage area. Ship machines are systems that can be operated by using steam and pleasure turbines other than diesel engines. However, the gas turbine is especially preferred only from combat aircraft. The most widely used diesel engine ship machines.