Terrorism
Terrorist acts frequently have a political purpose. Some official, governmental definitions of terrorism use the criterion of the illegitimacy or unlawfulness of the act. to distinguish between actions authorized by a government (and thus "lawful") and those of other actors, including individuals and small groups. For example, carrying out a strategic bombing on an enemy city, which is designed to affect civilian support for a cause, would not be considered terrorism if it were authorized by a government. This criterion is inherently problematic and is not universally accepted, because: it denies the existence of state terrorism. An associated term is violent non-state actor.
Islamic terrorism
Al-Qaeda's stated aim is the use of jihad to defend and protect Islam against Zionism, Christianity, Hinduism, the secular West, and Muslim governments such as Saudi Arabia, which it sees as insufficiently Islamic and too closely tied to the United States. Formed by Osama bin Laden and Muhammad Atef in the aftermath of the Soviet–Afghan War in the late 1980s, al-Qaeda called for the use of violence against civilians and military of the United States and any countries that are allied with it.