[1][2] In a narrower sense, it refers to the belief that armed confrontation is a theologically legitimate method of socio-political change towards an Islamic system of governance.
[25] The term has also been invoked to retroactively characterise the military campaigns of historic Islamic empires,[26][27] and later the Fula jihads in West Africa in the 18th and 19th centuries.
[38] "Jihadism" has been defined otherwise as a neologism for militant, predominantly Sunnī Islamic movements that use ideologically motivated violence to defend the Ummah (the collective Muslim world) from foreign Non-Muslims and those that they perceive as domestic infidels.
Furthermore, as the cases of Saudi and other Gulf regimes show, states may gain domestic legitimacy through economic development and social change, rather than based on religion and piety".
[49] According to Reuven Firestone, Jihadism as commonly used in Western sources describes "militant Islamic movements that are perceived as existentially threatening to the West.
[51] Shīʿas believe ʿAlī ibn Abī Ṭālib is the true successor to Muhammad, while Sunnīs consider Abu Bakr to hold that position.
[51][52][53] Sayyid Qutb, an Egyptian Islamist ideologue and a prominent leader of the Muslim Brotherhood in Egypt, was an influential promoter of the Pan-Islamist ideology during the 1960s.
[20] He was a prominent leader of the Muslim Brotherhood and a highly influential Islamist ideologue,[20][56] and the first to articulate these anathemizing principles in his magnum opus Fī ẓilāl al-Qurʾān (In the shade of the Qurʾān) and his 1966 manifesto Maʿālim fīl-ṭarīq (Milestones), which lead to his execution by the Egyptian government.
"[72] An explanation for jihadist willingness to kill civilians and self-professed Muslims on the grounds that they were actually apostates (takfīr) is the vastly reduced influence of the traditional diverse class of ulama, often highly educated Islamic jurists.
In "the vast majority" of Muslim countries during the post-colonial world of the 1950s and 1960s, the private religious endowments (awqāf) that had supported the independence of Islamic scholars and jurists for centuries were taken over by the state.
[76] De-Ba'athification policy initiated by the new government led to rise in support of jihadists and remnants of Iraqi Ba'athists started allying with al-Qaeda in their common fight against the United States.
One of these was the insistence on an operational link between Iraq and al-Qaeda... after the fall of the regime, the most potent ideological force behind the insurgency was Islam and its hostility to non-Islamic intruders.
The insurgency was called mukawama, or resistance, with overtones of religious legitimacy; its fighters became mujahideen, holy warriors; they proclaimed their mission to be jihad.
By the end of 2015, their self-declared caliphate ruled an area with a population of about 12 million,[85][86] where they enforced their extremist interpretation of Islamic law, managed an annual budget exceeding US$1 billion, and commanded more than 30,000 fighters.
[87] After a grinding conflict with American, Iraqi, and Kurdish forces, IS lost control of all their Middle Eastern territories by 2019, subsequently reverting to insurgency from remote hideouts while continuing their propaganda efforts.
[108] Scholars like Abul Ala Maududi, Abdullah Azzam, Ruhollah Khomeini, leaders of al-Qaeda and others, believe that defensive global jihad is a personal obligation, which means that no caliph or Muslim head of state needs to declare it.
Military and intelligent analyst Sebastian Gorka described the new interpretation of jihad as the "willful targeting of civilians by a non-state actor through unconventional means.
"[109][102] Al-Qaeda's splinter groups and competitors, Jama'at al-Tawhid wal-Jihad and the Islamic State of Iraq and Syria, are thought to have been heavily influenced[103][110][111][112][113] by a 2004 work on jihad entitled Management of Savagery (Idarat at-Tawahhush),[103] written by Abu Bakr Naji[103] and intended to provide a strategy to create a new Islamic caliphate by first destroying "vital economic and strategic targets" and terrifying the enemy with cruelty to break its will.
[103][115][116][117][118] The book has been described by counter-terrorism scholar Orwa Ajjoub as rationalizing and justifying "suicide operations, the mutilation of corpses, beheading, and the killing of children and non-combatants".
[103] The Guardian's journalist Mark Towsend, citing Salah al-Ansari of Quilliam, notes: "There is a startling lack of study and concern regarding this abhorrent and dangerous text [The Jurisprudence of Blood] in almost all Western and Arab scholarship".
[116] He states: Ranging from ruminations on the merits of beheading, torturing, or burning prisoners to thoughts on assassination, siege warfare, and the use of biological weapons, Muhajir's intellectual legacy is a crucial component of the literary corpus of ISIS—and, indeed, whatever comes after it—a way to render practically anything permissible, provided, that is, it can be spun as beneficial to the jihad.
[...] neither Zarqawi nor his inheritors have looked back, liberally using Muhajir's work to normalize the use of suicide tactics in the time since, such that they have become the single most important military and terrorist method—defensive or offensive—used by ISIS today.
He assesses that jihadists regard their actions as being "for the greater good"; that they are in a "weakened in the earth" situation that renders Islamic terrorism a valid means of solution.