What is the job description of a caliph in Islam?

A caliph in Islam is the political and religious leader of the Muslim community, serving as a successor to the Prophet Muhammad. The caliph's role includes upholding Islamic law (Sharia), maintaining order, and guiding the community in spiritual and temporal matters. Historically, caliphs were responsible for expanding the Islamic state, managing its affairs, and ensuring justice and governance according to Islamic principles. The title is often associated with the leadership of the early Islamic empires, particularly the Rashidun, Umayyad, and Abbasid caliphates.