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.

The conclave is a time-honored process conducted in secrecy behind the locked doors of the Vatican’s Sistine Chapel.

Final preparations are underway to start the conclave, which will elect Pope Francis' successor. The Vatican released video of workers installing a stove where ballots will be burned during the process.