All Roman Catholics are Christians, but not the other way around, differing in beliefs about the sacraments, the pope, the saints and the Virgin Mary.

Pope Francis's death at the age of 88 means the Catholic Church must choose a new leader. Here's how cardinals elect the next pontiff at the conclave.

A conclave is a meeting of the College of Cardinals where an election is held to determine who the next pope is. The conclave will begin on May 7 and continue until a new pope is selected. Only cardinals under the age of 80 are eligible to vote in a conclave. They are known as the cardinal electors, and their number is 135.