Islam (Arabic: الإسلام; al-'islām (help·info)) is a monotheistic religion originating with the teachings of Muhammad, a 7th-century Arab religious and political figure. The word Islam means "submission", or the total surrender of oneself to God (Arabic: الله, Allāh). An adherent of Islam is known as a Muslim, meaning "one who submits (to God)". There are between 0.9 and 1.4 billion Muslims, making Islam the second-largest religion in the world, after Christianity.
Muslims believe that God revealed the Qur'an to Muhammad, God's final prophet, and regard the Qur'an and the Sunnah (the words and deeds of Muhammad) as the fundamental sources of Islam. They do not regard Muhammad as the founder of a new religion, but as the restorer of the original monotheistic faith of Abraham, Moses, Jesus, and other prophets. Islamic tradition holds that Judaism and Christianity distorted the messages of these prophets over time either in interpretation, in text, or both.
Islam includes many religious practices. Adherents are generally required to observe the Five Pillars of Islam, which are five duties that unite Muslims into a community. In addition to the Five Pillars, Islamic law (sharia) has developed a tradition of rulings that touch on virtually all aspects of life and society. This tradition encompasses everything from practical matters like dietary laws and banking to warfare.
Almost all Muslims belong to one of two major denominations, the Sunni and Shi'a Shi'a. The schism developed in the late 7th century following disagreements over the religious and political leadership of the Muslim community. Roughly 85 percent of Muslims are Sunni and 15 percent are Shi'a. Islam is the predominant religion throughout the Middle East, as well as in parts of Africa and Asia. Large communities are also found in China, Western Europe, the Balkan Peninsula, and Russia. About 20 percent of Muslims live in Arab countries.