A turbojet is a kind of jet engine that works by squeezing air into a small space, mixing it with fuel, and setting it on fire. The mixture of fuel and air goes out the back of the engine and pushes it forward. As it leaves the engine it spins a turbine which turns a compressor at the front which sucks in more air and compresses it.
Turbofan engines are more complex. They are more common today because they can make more power for the same amount of fuel than a turbojet. They also make less noise. Supersonic aircraft still use the simpler kind.
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- W. Austyn Mair, Aircraft Performance (Cambridge; New York: Cambridge University Press, 1992), pp. 77–78