The Sunnah, which consists of the teachings, actions, and approvals of the Prophet Muhammad, is of great importance in Islam as it complements and explains the Quran. It provides practical guidance on living according to Islamic principles, covering all aspects of life, from worship and morality to social relations and personal conduct. The Sunnah serves as a source of Islamic law (Sharia) and a model for Muslims to emulate, helping them understand the Quranic text in context and apply it in daily life.