Tuhid, or Tawhid, is the Islamic concept of the oneness and uniqueness of God (Allah). It emphasizes that there is no deity worthy of worship except Allah, who is singular and indivisible. Tuhid serves as the foundation of Islamic faith, asserting that God is transcendent, self-sufficient, and has no partners or equals. This belief shapes the entire worldview of Muslims, influencing their worship, ethics, and understanding of existence.