The Catholic Church is the largest Christian Church and the largest organized body of any world religion. It is a worldwide organization made up of one Western or Latin-Rite and 22 Eastern Rite particular Churches, all of which have the Holy See of Rome as their highest authority. It is divided into jurisdictional areas, usually on a territorial basis. The standard territorial unit is called a diocese in the Latin Rite and an eparchy in the Eastern Rites, each of which is headed by a bishop.