Al-Qaeda is a pan-Islamist militant organization led by Sunni Islamist jihadists who self-identify as a vanguard spearheading a global Islamist revolution to unite the Muslim world under a supra-national Islamic caliphate. Its membership is primarily composed of Arabs, with additional representation from other ethnic groups. Al-Qaeda has mounted attacks on civilian and military targets of the U.S. and its allies; such as the 1998 U.S. embassy bombings, the USS Cole bombing, and the September 11 attacks. It has been designated a terrorist organization by the United Nations and over two dozen countries around the world.
The organization was founded in a series of meetings held in Peshawar during 1988, attended by Abdullah Yusuf Azzam, Osama bin Laden, Mohammed Atef, Ayman Al-Zawahiri and other veterans of the Soviet–Afghan War. Building upon the networks of Maktab Al-Khidamat, the founding members decided to create the organization to serve as a "vanguard" for jihad. When Iraqi forces invaded and occupied Kuwait in 1990, bin Laden offered to support Saudi Arabia by sending his mujahideen fighters. His offer was rebuffed by the Saudi government, which instead sought the aid of the United States. The stationing of U.S. troops in the Arabian Peninsula prompted bin Laden to declare a jihad against both the rulers of Saudi Arabia – whom he denounced as murtadd (apostates) – and against the US. From 1992, al-Qaeda established its headquarters in Sudan until it was expelled in 1996. It then shifted its base to the Taliban-ruled Afghanistan and later expanded to other parts of the world, primarily in the Middle East and South Asia. In 1996 and 1998, bin Laden issued two fatwās that demanded the withdrawal of U.S. troops from Saudi Arabia.
In 1998, al-Qaeda conducted the US embassy bombings in Kenya and Tanzania, which killed 224 people. The U.S. retaliated by launching Operation Infinite Reach, against al-Qaeda targets in Afghanistan and Sudan. In 2001, al-Qaeda carried out the September 11 attacks, resulting in nearly 3,000 deaths, long-term health consequences of nearby residents, damage to global economic markets, the triggering of drastic geo-political changes as well as generating profound cultural influence across the world. The U.S. launched the war on terror in response and invaded Afghanistan to depose the Taliban and destroy al-Qaeda. In 2003, a U.S.-led coalition invaded Iraq, overthrowing the Ba'athist regime which they falsely accused of having ties with al-Qaeda. In 2004, al-Qaeda launched its Iraqi regional branch. After pursuing him for almost a decade, the U.S. military killed bin Laden in Pakistan in May 2011.
Al-Qaeda members believe that a Judeo-Christian alliance led by the U.S. is waging a war against Islam and conspiring to destroy Islam. Al-Qaeda also opposes man-made laws, and seek to implement sharia law in Muslim countries. Al-Qaeda fighters characteristically deploy tactics such as suicide attacks (Inghimasi and Istishhadi operations) involving simultaneous bombing of several targets in battle-zones. Al-Qaeda's Iraq branch, which later morphed into the Islamic State of Iraq after 2006, was responsible for numerous sectarian attacks against Shias during the Iraqi insurgency. Al-Qaeda ideologues envision the violent removal of all foreign and secularist influences in Muslim countries, which it denounces as corrupt deviations. Following the death of bin Laden in 2011, al-Qaeda vowed to avenge his killing. The group was then led by Egyptian Ayman Al-Zawahiri, until he too was killed by the U.S. in 2022. As of 2021, they have reportedly suffered from a deterioration of central command over its regional operations.
The English name of the organization is a simplified transliteration of the Arabic noun al-qāʿidah (القاعدة), which means "the foundation" or "the base". The initial al- is the Arabic definite article "the", hence "the base". In Arabic, al-Qaeda has four syllables (/alˈqaː.ʕi.da/). However, since two of the Arabic consonants in the name are not phones found in the English language, the common naturalized English pronunciations include , and . Al-Qaeda's name can also be transliterated as al-Qaida, al-Qa'ida, or el-Qaida.
The doctrinal concept of al-Qaeda was first coined by the Palestinian Islamist scholar and jihadist leader Abdullah Azzam in an April 1988 issue of Al-Jihad magazine to describe a religiously committed vanguard of Muslims who wage armed jihad globally to liberate oppressed Muslims from foreign invaders, establish sharia (Islamic law) across the Islamic world by overthrowing the ruling secular governments; and thus restore the past Islamic prowess. This was to be implemented by establishing an Islamic state that would nurture generations of Muslim soldiers that would perpetually attack Americans and the U.S.' allied governments in the Islamic world. Numerous historical models were cited by Azzam as successful examples of his call; starting from the early Muslim conquests of the 7th century to the recent anti-Soviet Afghan mujahideen of the 1980s. According to Azzam's world-view: It is about time to think about a state that would be a solid base for the distribution of the (Islamic) creed, and a fortress to host the preachers from the hell of the Jahiliyyah [the pre-Islamic period].
Bin Laden explained the origin of the term in 2001:
The name 'al-Qaeda' was established a long time ago by mere chance. The late Abu Ebeida El-Banashiri established the training camps for our mujahedeen against Russia's terrorism. We used to call the training camp al-Qaeda. The name stayed.
It has been argued that two documents seized from the Sarajevo office of the Benevolence International Foundation prove the name was not simply adopted by the mujahideen movement and that a group called al-Qaeda was established in August 1988. Both of these documents contain minutes of meetings held to establish a new military group, and contain the term "al-Qaeda".
Former British Foreign Secretary Robin Cook wrote that the word al-Qaeda should be translated as "the database", because it originally referred to the computer file of the thousands of mujahideen militants who were recruited and trained with CIA help to defeat the Soviets. In April 2002, the group assumed the name Qa'idat Al-Jihad (قاعدة الجهاد qāʿidat al-jihād), which means "the base of Jihad". According to Diaa Rashwan, this was "apparently as a result of the merger of the overseas branch of Egypt's Al-Jihad, which was led by Ayman al-Zawahiri, with the groups bin Laden brought under his control after his return to Afghanistan in the mid-1990s."
Al-Qaeda only indirectly controls its day-to-day operations. Its philosophy calls for the centralization of decision making, while allowing for the decentralization of execution. The top leaders of al-Qaeda have defined the organization's ideology and guiding strategy, and they have also articulated simple and easy-to-receive messages. At the same time, mid-level organizations were given autonomy, but they had to consult with top management before large-scale attacks and assassinations. Top management included the shura council as well as committees on military operations, finance, and information sharing. Through the information committees of al-Qaeda, al-Zawahiri placed special emphasis on communicating with his groups. However, after the war on terror, al-Qaeda's leadership has become isolated. As a result, the leadership has become decentralized, and the organization has become regionalized into several al-Qaeda groups.
The group was initially dominated by Egyptians and Saudis, with some participation from Yemenis and Kuwaitis. Over time, it has evolved into a more international terrorist organization. While its core group originally shared a background in Egypt and the Arabian Peninsula, it has since attracted fighters from other Arab groups, including North Africans, Jordanians, Palestinians, and Iraqis. In the decade following the 9/11 attacks, Muslims from non-Arab backgrounds, such as Pakistanis, Afghans, Turks, Kurds, and European converts to Islam, have also joined the organization.