"Boko Haram emerged in the early 2000s as a small Sunni Islamic sect in Nigeria advocating a strict interpretation and implementation of Islamic law, and has evolved since 2009 to become one of the world's deadliest terrorist groups. The nickname Boko Haram was given by local communities to describe the group's narrative that Western education and culture are corrupting influences and haram ('forbidden'). The group called itself Jama'a Ahl as-Sunna Li-da'wa waal Jihad (roughly translated from Arabic as 'People Committed to the Propagation of the Prophet's Teachings and Jihad'). In 2015, its leadership pledged allegiance to the Islamic State (IS, aka ISIS/ISIL), and renamed itself as the Islamic State's West Africa Province (aka ISWAP, ISIS-WA, hereafter IS-WA). The group, still widely referred to as Boko Haram, subsequently split into two factions. Both pose an ongoing security threat in Nigeria and the surrounding Lake Chad Basin region."
Library of Congress. Congressional Research Service