I want to know about Al-Qaeda

Al-Qaeda (pronounced /ælˈkaɪdə/ al-KYE-də or /ælˈkeɪdə/ al-KAY-də; Arabic: القاعدة‎, al-qāʿidah, "the base"), alternatively spelled al-Qaida and sometimes al-Qa'ida, is an Islamist group founded sometime between August 1988 and late 1989. It operates as a network comprising both a multinational, stateless arm and a fundamentalist Sunni movement calling for global jihad.

Al-Qaeda has attacked civilian and military targets in various countries, most notably, the September 11 attacks on New York City and Washington, D.C. in 2001. The US government responded by launching the War on Terror.

Characteristic techniques include suicide attacks and simultaneous bombings of different targets. Activities ascribed to it may involve members of the movement, who have taken a pledge of loyalty to Osama bin Laden, or the much more numerous "al-Qaeda-linked" individuals who have undergone training in one of its camps in Afghanistan or Sudan, but not taken any pledge.

Al-Qaeda ideologues envision a complete break from the foreign influences in Muslim countries, and the creation of a new Islamic caliphate. Reported beliefs include that a Christian-Jewish alliance is conspiring to destroy Islam, which is largely embodied in the U.S.-Israel alliance, and that the killing of bystanders and civilians is religiously justified in jihad.