This document from Islamweb.net discusses the Islamic definition of bid'ah (innovation) in religion. It provides definitions from several Islamic scholars that bid'ah refers to any form of worship that is not supported by the Quran, hadith or statements of the Prophet's companions. It outlines general rules for identifying bid'ah and examines some claims made to support certain innovations, refuting them. The dangers of bid'ah mentioned include dividing Muslims and altering the religion. Reasons for innovations include ignorance of Islam and following one's desires.