An insurgency is a violent, armed rebellion by small, lightly armed bands who practice guerrilla warfare against a larger authority. The key descriptive feature of insurgency is its asymmetric nature: small irregular forces face a large, well-equipped, regular military force state adversary. Due to this asymmetry, insurgents avoid large-scale direct battles, opting instead to blend in with the civilian population (often in rural areas) where they gradually expand territorial control and military forces. Insurgency frequently hinges on control of and collaboration with local populations.
An insurgency can be fought via counter-insurgency warfare, as well as other political, economic and social actions of various kinds. Due to the blending of insurgents with the civilian population, insurgencies tend to involve considerable violence against civilians (by the state and the insurgents). State attempts to quell insurgencies frequently lead to the infliction of indiscriminate violence, whereas rebel control of territory frequently involves violence against the civilian population. Insurgency sets itself apart from terrorism by aiming for political control rather than resorting to indiscriminate violence, however, it may incorporate terrorist tactics.