Eli5, what’s the difference between ramjet, scramjet, and turbojet?

Question

I’m an aviation nut but for the love of me I can’t find an explanation that makes sense to me

In: 24

Answer 1

A ramjet uses the high speed air entering the engine to compress and combust the fuel. A scramjet is a series of explosions that creates a lot of thrust. A turbojet compresses the air with fans not too dissimilar from a turbocharger on your car. Once running it sustains itself.