Islamic fundamentalism is a term used to describe religious ideologies seen as advocating a return to the "fundamentals" of Islam

Islam

Islam . The most common are and .   : Arabic pronunciation varies regionally. The first vowel ranges from ~~. The second vowel ranges from ~~~...

: the Quran and the Sunnah

Sunnah

The word literally means a clear, well trodden, busy and plain surfaced road. In the discussion of the sources of religion, Sunnah denotes the practice of Prophet Muhammad that he taught and practically instituted as a teacher of the sharī‘ah and the best exemplar...

. Definitions of the term vary. According to Christine L. Kettel, it is deemed problematic by those who suggest that Islamic belief requires all Muslims to be fundamentalists, and by others as a term used by outsiders to describe perceived trends within Islam.