Islam (Arabic: الإسلام; al-'islām (help·info); pronounced: [ɪs.ˈlæːm][note 1]) is a monotheistic, Abrahamic religion originating with the teachings of the Islamic prophet 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).[1] An adherent of Islam is known as a Muslim[2], meaning "one who submits [to God]".[3][4] The word Muslim is the participle of the same verb of which Islām is the infinitive. There are between 1 billion and 1.8 billion Muslims, making Islam the second-largest religion in the world, after Christianity.[5]

Muslims believe that God revealed the Qur'an to Muhammad, God's final prophet, through the angel Gabriel, and regard the Qur'an and the Sunnah[6] (words and deeds of Muhammad) as the fundamental sources of Islam.[7] They do not regard Muhammad as the founder of a new religion, but as the restorer of the original monotheistic faith of Abraham[8], Moses, Jesus, and other prophets. Islamic tradition holds that Jews and Christians distorted the revelations God gave to these prophets by either altering the text, introducing a false interpretation, or both.[9]

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.[10] 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 and welfare.[11]
Almost all Muslims belong to one of two major denominations, the Sunni (85%) and Shi'a (15%). The schism developed in the late 7th century following disagreements over the religious and political leadership of the Muslim community. Islam is the predominant religion in much of Africa and the Middle East, as well as in major parts of Asia.[12] Large communities are also found in China, the Balkan Peninsula in Eastern Europe and Russia. There are also large Muslim immigrant communities in other parts of the world, such as Western Europe. About 20% of Muslims live in Arab countries,[13] 30% in the Indian subcontinent and 15.6% in Indonesia, the largest Muslim country by population.[14]