What is Islamic Fundamentalism?

Islamic fundamentalism has been defined as a movement of Muslims who regard earlier times favorably and seek to return to the fundamentals of the Islamic religion and live similarly to how the prophet Muhammad and his companions lived. Islamic fundamentalists favor "a literal and originalist interpretation" of the primary sources of Islam (the Quran and Sunnah), seek to eliminate (what they perceive to be) "corrupting" non-Islamic influences from every part of their lives and see "Islamic fundamentalism" as a pejorative term used by outsiders for Islamic revivalism and Islamic activism.