God usually refers to the single deity in monotheism or the monist deity in polytheism. God is often conceived of as the supernatural creator and overseer of humans and the universe. Theologians have ascribed a variety of attributes to the many different conceptions of God. The most common among these include omniscience (infinite knowledge), omnipotence (unlimited power), omnipresence (present everywhere), omnibenevolence (perfect goodness), divine simplicity, and eternal and necessary existence.
God has also been conceived as being incorporeal (immaterial), a personal being, the source of all moral obligation, and the “greatest conceivable existent”. These attributes were supported to varying degrees by the early Jewish, Christian and Muslim theologian philosophers. Many notable medieval philosophers and modern philosophers have developed arguments for and against the existence of God.
There are many names for God, and different names are attached to different cultural ideas about who God is and what attributes he possesses. In the Hebrew Bible “I Am that I Am,” and the “Tetragrammaton” YHVH are used as names of God, while Yahweh, and Jehovah are sometimes used in Christianity as vocalizations of YHVH. In Arabic, the name Allah (“the God”) is used, and because of the predominance of Islam among Arab speakers, the name “Allah” has connotations with Islamic faith and culture. Muslims regard a multitude of titular names for God, while in Judaism it is common to refer to God by the titular names like Elohim or Adonai. In Hinduism, Brahman is often considered a monistic deity. Other religions have names for God, for instance, Baha in the Bahá’í Faith, Waheguru in Sikhism, and Ahura Mazda in Zoroastrianism.