The
Catholic Church, often referred to as the
Roman Catholic Church, is the largest Christian church and the largest religious denomination, with approximately 1.3 billion baptised Catholics worldwide as of 2019. As the world's oldest and largest continuously functioning international institution, it has played a prominent role in the history and development of Western civilisation. The church consists of 24 particular churches and almost 3,500 dioceses and eparchies around the world. The pope, who is the Bishop of Rome, is the chief pastor of the church, entrusted with the universal Petrine ministry of unity and correction. The church's administration, the Holy See, is in the Vatican City, a tiny enclave of Rome, of which the pope is head of state.