Islam (English play /ˈɪzlɑːm/;[note 1] Arabic: الإسلام‎ al-ʾislām  IPA: [ʔɪsˈlæːm] ( listen)[note 2]) is the monotheistic religion articulated by the Qur’an, a text considered by its adherents to be the verbatim word of God (Arabic: الله‎ Allāh), and by the teachings and normative example (called the Sunnah and composed of Hadith) ofMuhammad, considered by them to be the last prophet of God. An adherent of Islam is called a Muslim.

Muslims believe that God is one and incomparable and the purpose of existence is to worship God.[1][2] Muslims also believe that Islam is the complete and universal version of a primordial faith that was revealed at many times and places before, including through AbrahamMoses and Jesus, whom they considerprophets.[3] Muslims maintain that previous messages and revelations have been partially changed or corrupted over time,[4] but consider the Qur’an to be both the unaltered and the final revelation of God.[5] Religious concepts and practices include the five pillars of Islam, which are basic concepts and obligatory acts of worship, and following Islamic law, which touches on virtually every aspect of life and society, providing guidance on multifarious topics from banking and welfare, towarfare and the environment.[6][7]

Most Muslims belong to one of two denominations; with 80-90% being Sunni and 10-20% being Shia.[8][9][10] About 13% of Muslims live in Indonesia, the largest Muslim country,[11] 25% in South Asia,[11] 20% in the Middle East,[12] 2% in Central Asia, 4% in the remaining South East Asian countries, and 15% in Sub-saharan Africa.[13] Sizable communities are also found in China and Russia, and parts of Europe. Converts and immigrant communities are found in almost every part of the world (see Islam by country). With about 1.3-1.57 billion Muslims, comprising about 21-23% of the world’s population,[13][14][15] Islam is the second-largest religion and one of the fastest-growing religions in the world.[16][17]