Simply put, a conclave is the assembly of cardinals that elects a pope. The word itself comes from the Latin "com" and "clavis," meaning "together" and "key," respectively – highlighting the absolute, behind-closed-doors secrecy with which the cardinals conduct their discussions and balloting.

Pope Francis’ emphasis on reaching out to the “peripheries" of the church and world will result in the most diverse collection of church leaders in history gathering to select the new pope.

A papal conclave, the election of a new pope, tends to begin 15-20 days after a papal vacancy. Black or white smoke indicates each day's decision.