Tank Destroyer or tank hunter is a type of armoured fighting vehicle, armed with a direct-fire Artillery Gun or Anti-Tank Gun with limited operational capacities and designed specifically to engage enemy Tanks.
Tanks are Armoured Fighting Vehicle designed for front-line combat, combining operational mobility and Tactic offensive and defensive capabilities; tanks perform all primary tasks of the armoured troops. The tank destroyer on the other hand is specifically designed to take on enemy armour. Many Tank Destroyer are based on existing Tank chassis.
Since World War II, gun-armed tank destroyers have fallen out of favor as armies have favored multirole Main Battle Tank.