Monotheism is the belief in the existence of one single God or supreme being, who is typically seen as the creator and ruler of the universe. This belief system is central to several major world religions, including Judaism, Christianity, and Islam, which each have their own distinct theological understandings of this one God. Monotheism contrasts with polytheism, which is the belief in multiple gods, and atheism, which is the disbelief in any gods. The development of monotheistic beliefs has had a profound impact on the religious, philosophical, and ethical traditions of many cultures, shaping moral codes, worldviews, and social institutions. The concept of a single, all-powerful God often implies a unified and coherent understanding of the cosmos and humanity's place within it.