Which is more advanced, turbojet or turbofan?

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Turbojet and turbofan engines are not directly comparable; meaningful comparison requires specific conditions. For modern fighter aircraft, turbofans are far superior to turbojets, primarily due to their better thrust-to-weight ratio and fuel efficiency. However, as speed increases, the advantages of turbojets become more apparent, and the fan of a turbofan can become a hindrance. This has led to the development of variable cycle engines that integrate the benefits of both. More relevant information is as follows: Differences between turbojet and turbofan engines: Bypass ratio varies. Turbojets have a single bypass duct, while turbofans have two. Turbojets only have a compressor before the combustion chamber, whereas turbofans have both a compressor and a fan. In turbofans, part of the incoming air flows into the outer bypass duct, and part enters the combustion chamber, whereas in turbojets, all air enters the combustion chamber. The thrust of a turbojet engine is generated by exhaust gases from the nozzle, but this exhaust stream still has high velocity, temperature, and pressure. Front section configuration: Turbofan engines have a fan at the front, which uses fan exhaust to generate thrust. An engine is a machine capable of converting other forms of energy into mechanical energy, applicable both to power generation devices and to entire machines including power units.