Islamism is a concept whose meaning has been debated in both public and academic contexts. The term can refer to diverse forms of social and political activism advocating that public and political life should be guided by Islamic principles or in some cases to movements which call for full implementation of sharia. It is commonly used interchangeably with the terms political Islam or Islamic fundamentalism. In Western media usage the term tends to refer to groups who aim to establish a sharia-based Islamic state, often with implication of violent tactics and human rights violations, and has acquired connotations of political extremism. In the Muslim world, the term has positive connotations among its proponents.
Different currents of Islamist thought include advocating a "revolutionary" strategy of Islamizing society through exercise of state power, and alternately a "reformist" strategy to re-Islamizing society through grass-roots social and political activism. Islamists may emphasize the implementation of Sharia (Islamic law);pan-Islamic political unity, including an Islamic state; or selective removal of non-Muslim, particularly Western military, economic, political, social, or cultural influences in the Muslim world that they believe to be incompatible with Islam.
Graham Fuller has argued for a broader notion of Islamism as a form of identity politics, involving "support for [Muslim] identity, authenticity, broader regionalism, revivalism, [and] revitalization of the community." Some authors hold the term "Islamic activism" to be synonymous and preferable to "Islamism", and Rached Ghannouchi writes that Islamists prefer to use the term "Islamic movement" themselves.
Central and prominent figures in twentieth-century Islamism include Hasan al-Banna, Sayyid Qutb, Abul Ala Maududi, and Ruhollah Khomeini. Most Islamist thinkers emphasize peaceful political processes, which are supported by the majority of contemporary Islamists. Others, Sayyid Qutb in particular, called for violence, and his followers are generally considered Islamic extremists, although Qutb denounced the killing of innocents. According to Robin Wright, Islamist movements have "arguably altered the Middle East more than any trend since the modern states gained independence", redefining "politics and even borders". Following the Arab Spring, some Islamist currents became heavily involved in democratic politics, while others spawned "the most aggressive and ambitious Islamist militia" to date, ISIS.