Multijet is a specific term used in the automotive industry to describe a type of common rail diesel engine technology developed by Fiat. However, there are several other terms that are often used interchangeably with multijet. These include common rail, direct injection, and high-pressure fuel injection. Common rail refers to the method of fuel delivery, in which a high-pressure fuel rail is used to supply fuel to each injector, resulting in more precise and efficient combustion. Direct injection is another term used for fuel delivery, where fuel is injected directly into the combustion chamber, resulting in better fuel economy and reduced emissions. High-pressure fuel injection also refers to the use of high-pressure fuel delivery to improve combustion efficiency and reduce emissions.