Suck, Squeeze, Bang and Blow - That’s how a jet engine works!

It sucks in air from the surrounding,

squeezes it up with the compressor, 

and when fuel is added and ignited, the bang occurs. 

The air is blown out the back  and this produces Thrust.

And no, I am not oversimplifying things. It is really that Simple. ;)

Happy Halloween!

PC: nasa, bbc, imgur,worldofwarplanes.

EDIT: This principle can also be used to understand how your car engine works as well.