In most cases a Cardinal is also a Bishop, being a member in the Episcopal Order. Only the Cardinal, the head of a diocese is required to be a Bishop. The main duties of a Bishop are to teach the Catholic faith and to administrate the Church. The Bishop is the only one who has the power to confer the sacrament of the Holly Order. Due to his duty of teaching faith, in some English speaking countries, at the name of the bishops it is added the post nominal title D.D, meaning Doctor of Divinity. On average, a Catholic Bishop makes $16,000-$19,000 per year.