Afterburners

Afterburners are seen on many jet fighters to give their engines extra thrust. The afterburner is a section of the engine that comes after the jet engine, burning extra fuel to generate extra thrust.

How Does an Afterburner Work?
In a Nutshell: Afterburners
(See also this more detailed view)
Jet Nozzle Test – Turbine Engines: A Closer Look
Afterburner Fuel System

Afterburners in action

Powerful F-16 Afterburner Takeoff
F-16 Full Afterburner – 11 litres fuel per second!