Unconventional warfare (abbreviated UW) is the opposite of conventional warfare. Whereas conventional warfare is used to reduce the opponent's military capability using conventional weapons (rifles, grenades, etc.) and battlefield tactics, unconventional warfare is an attempt to achieve military victory through acquiescence, capitulation, or clandestine support for one side of an existing conflict.
On the surface, UW contrasts with conventional warfare in that forces or objectives are covert or not well-defined, tactics and weapons intensify environments of subversion or intimidation, and the general or long-term goals are coercive or subversive to a political body.
The general objective of unconventional warfare is to instill a belief that peace and security are not possible without compromise or concession. Specific objectives include inducement of war-weariness, curtailment of civilian standards of living and civil liberties associated with greater security demands, economic hardship linked to the costs of war; hopelessness to defend against assaults, terror, depression, and disintegration of morale. Two original definition are claiming: "The intent of U.S. Unconventional Warfare efforts is to exploit a hostile power’s political, military, economic, and psychological vulnerabilities by developing and sustaining resistance forces to accomplish U.S. strategic objectives." or according to John F. Kennedy: "There is another type of warfare—new in its intensity, ancient in its origin—war by guerrillas, subversives, insurgents, assassins; war by ambush instead of by combat, by infiltration instead of aggression, seeking victory by eroding and exhausting the enemy instead of engaging him. It preys on unrest.