Compression-ignition engines, commonly known as diesel engines, have become an essential component of modern-day transportation and industrial machines. However, depending on the context, there are several alternative terms that can be used to describe these engines. For instance, some people may refer to them as compression engines, diesel motors, or even oil-burning engines. Others may use more technical terms, such as CI engines, direct-injection engines, or compression-ignition internal combustion engines. Ultimately, the term used to describe these engines may vary depending on the field or industry being discussed. But no matter what they are called, compression-ignition engines remain a vital player in today's economy.