The compression ignition engine is also known as a diesel engine, named after its inventor Rudolf Diesel. Another synonym for this type of engine is a compression-ignited engine, as the fuel ignites due to the high temperatures and pressure created by the compression of air in the cylinder. Diesel engines are also often called oil engines and are used in a variety of vehicles, including trucks, buses, and boats. Additionally, some specific types of compression ignition engines include direct injection diesel engines and indirect injection diesel engines. Ultimately, these engines are known for their efficiency and long lifespan, making them a popular choice in many sectors.