Islam is a monotheistic and Abrahamic religion articulated by the Quran, a book considered by its adherents to be the verbatim word of God (Arabic: Allah) and by the teachings and normative example (called the Sunnah and composed of hadith) of Muhammad 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. Muslims also believe that Islam is the complete and universal version of a primordial faith that was revealed before many times throughout the world, including notably through Adam, Noah, Abraham, Moses and Jesus, whom they consider prophets. They maintain that the previous messages and revelations have been partially misinterpreted or altered over time, but consider the Arabic Quran to be both the unaltered and the final revelation of God. 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, to family life and the environment.