Wahhabism is best described as:
A strict movement in Sunni Islam that wants Muslims to follow the original teaching of Islam.
It is an austere form of Islam that originated in the 18th century in what is now Saudi Arabia, founded by the cleric Muhammad ibn Abd al-Wahhab. Wahhabism emphasizes a return to what its followers consider the pure, unadulterated teachings of Islam, often rejecting practices that they view as innovations (bid'ah) or deviations from the original teachings of the Quran and Hadith. It has been influential in the formation of contemporary Islamic thought in the region.