Internal Security·Definition

ISIS and Global Jihad — Definition

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Version 1Updated 7 Mar 2026

Definition

ISIS, an acronym for the Islamic State of Iraq and Syria, also known as ISIL (Islamic State of Iraq and the Levant) or by its Arabic acronym Daesh, is a Sunni jihadist terrorist organization that emerged from the remnants of Al-Qaeda in Iraq (AQI).

Its defining moment came in June 2014 when its leader, Abu Bakr al-Baghdadi, declared a global caliphate, asserting religious, political, and military authority over all Muslims worldwide. This declaration marked a significant departure from traditional terrorist groups, as ISIS sought not just to conduct attacks but to establish and govern a physical state based on its extreme interpretation of Islamic law (Sharia).

The ideology of ISIS is rooted in Salafi jihadism, a fundamentalist and violent interpretation of Sunni Islam. Key tenets include 'takfir,' the practice of excommunicating and declaring other Muslims (especially Shias, Sufis, and even Sunnis who do not adhere to their strict interpretation) as apostates, thereby justifying their killing.

They believe in an apocalyptic vision, seeing themselves as fulfilling prophecies related to the end times, which fuels their relentless pursuit of a global caliphate. This ideology demands absolute loyalty to the 'Caliph' and rejects all existing national borders and secular governance structures.

Operationally, ISIS distinguished itself through its extreme brutality, including mass executions, beheadings, sexual slavery (particularly of Yazidis), and the destruction of cultural heritage sites.

These acts were not random but calculated to instill fear, assert dominance, and attract radicalized individuals globally. They mastered the use of social media and sophisticated propaganda, producing high-quality videos, online magazines like 'Dabiq,' and utilizing encrypted messaging apps to recruit foreign fighters from over 100 countries.

These foreign fighters were crucial for their territorial expansion and for spreading their ideology.

Geographically, ISIS rapidly seized vast swathes of territory in Iraq and Syria between 2014 and 2017, establishing administrative structures, collecting taxes, and providing basic services in areas under its control.

This territorial 'caliphate' became a magnet for jihadists and a base for planning external attacks. However, an international coalition, led by the United States, launched a concerted military campaign (Operation Inherent Resolve) that, combined with efforts by local forces, led to the gradual erosion and eventual territorial defeat of ISIS by March 2019.

Despite losing its physical caliphate, ISIS has transitioned into a decentralized global network. It continues to operate through clandestine cells in Iraq and Syria and has established or inspired numerous affiliates across Africa, Asia, and the Middle East, such as ISIS-Khorasan (ISIS-K) in Afghanistan, Boko Haram in West Africa, and Abu Sayyaf in the Philippines.

These affiliates carry out attacks, recruit new members, and maintain the group's ideological presence. The global jihad movement, of which ISIS is a prominent but not exclusive part, represents a persistent threat characterized by its adaptability, ideological resilience, and capacity to inspire lone-wolf attacks even without direct command and control.

From a UPSC perspective, understanding ISIS involves not just its history but its evolving threat, recruitment methods, ideological underpinnings, and the complex international and national counter-terrorism responses.

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