How do jet engines work? 

jet engine is an internal combustion engine that provides propulsion by utilizing Newton’s third law of motion. In general, it works by sucking in and compressing air with powerful turbines that rotate within the engine at extremely high speeds. These types of jet engines are commonly known as airbreathing jet engines. There are also other forms of jet engines that use means other than air in order to provide propulsion but still operate under the same principle. Jet engines are popularly known to be used by aircraft.
There are various types of jet engines all of which operate based on the principle of jet propulsion. These are briefly discussed below.

Airbreathing Jet Engine
Airbreathing jet engines achieve propulsion by drawing air in and heating it with a compressor and then subsequently ejecting a jet of hot exhaust gases. Airbreathing jet engines have various designs such as Turbine Powered, which include turbojet, turbofan, turboprop, turboshaft and propfan, and Ram Powered such as ramjet and scramjet.
Airbreathing Jet Engine