Prophet Muhammad is recognized as the founder of Islam and is revered by Muslims as a prophet and messenger of God, regarded as the final bearer of divine guidance in a long tradition of monotheistic prophets. Muslims believe that he reaffirmed the original faith of earlier prophets such as Adam, Noah, Abraham, Moses, and Jesus, restoring pure monotheism. Beyond his religious role, he is viewed as a statesman, moral reformer, lawgiver, military leader, and spiritual guide whose life reflects comprehensive human leadership shaped by divine instruction. According to Islamic belief, during a period of deep reflection and meditation in the mountains surrounding Mecca, he received his first revelation at the age of forty during the month of Ramadan. These revelations continued throughout his lifetime and were later compiled as the Qur’an, which Muslims consider the literal word of God. Following the initial revelation, he publicly conveyed the message of absolute monotheism, emphasizing complete submission to God as the foundation of faith and conduct. The Qur’an, along with the recorded sayings and actions of the Prophet, forms the primary source of Islamic belief and practice. His life and teachings have been studied, debated, and interpreted across centuries, making historical reconstruction both rich and complex. This encyclopaedia presents these teachings, narratives, and reflections in a clear and accessible manner, drawing upon authentic sources related to the Prophet and his companions. Intended as a scholarly yet approachable work, it serves as a valuable reference for Islamic studies and related academic disciplines.