Improvised explosive device

An improvised explosive device (IED) is a bomb constructed and deployed in ways other than in conventional military action. It may be constructed of conventional military explosives, such as an artillery shell, attached to a detonating mechanism. IEDs are commonly used as roadside bombs, or homemade bombs.

The term "IED" was coined by the British Army during the Northern Ireland conflict to refer to booby traps made by the IRA, and entered common use in the U.S. during the Iraq War.

IEDs are predominantly utilized by violent non-state actors, such as guerrilla or terrorist organizations, who use them in the context of strategies and tactics of insurrection, guerrilla warfare, asymmetric warfare, urban warfare or in terrorist operations. IEDs can also be utilized by state special forces or commando forces, to conduct unconventional warfare in a theatre of operations, such as in the case, for example, of the United States Army Special Forces.