Diesel ships are vessels powered by diesel engines, which convert fuel into mechanical energy to propel the ship. These engines are known for their efficiency and reliability, making them a popular choice for various types of marine transportation, including cargo ships, tankers, and passenger ferries. The use of diesel engines in ships allows for greater fuel economy compared to traditional steam engines. Additionally, diesel ships can operate at lower speeds while maintaining good performance, making them suitable for long-distance voyages across oceans and seas.