Jihad is an Arabic word meaning "struggle." Jihad is one of the five pillars of Islam, and many scholars have written about its meaning and application. In a moderate context, jihad can often refer to a personal struggle or crisis of faith, or to describe the historical battles of the Prophet Mohammed. Extremists use jihad to mean a fight against anyone they perceive to be an enemy of Islam — including Christians, Jews, the West and even moderate Muslims.

This database provides an overview of many of the terms and individuals used by or associated with movements and groups that subscribe to and/or promote extremist or hateful ideologies.