Linked from
The 16 pages that link to Afterburner, each with the reason it gives.
CombustionBroader topic: It uses combustion to increase thrust, at the cost of fuel efficiency.
TurbojetBroader topic: Some turbojets add it for greater thrust, at a substantial fuel cost.
Jet AgeRelated: Military jets used afterburners for rapid acceleration and supersonic flight.
Jet aircraftRelated: Military jet aircraft use it for brief increases in thrust, at high fuel cost.