President Trump and President Volodymyr Zelensky of Ukraine are among the world leaders who plan to attend the funeral. The conclave to choose his successor will most likely start at least a week later.

Heads of state are expected for Francis’ funeral, but the three days of public viewing in the basilica allow ordinary Catholics to grieve the Argentine pope. The viewing ends Friday at 7 p.m., after which Francis’ casket will be closed and sealed.

An Irish-born American cardinal was entrusted by Pope Francis to be the camerlengo, the Vatican official who runs the Holy See after the death of one pontiff and before the election of another.

Following Pope Francis' death Monday at age 88, the Vatican will have an acting head until a new pontiff is chosen during the conclave process. That acting head, or camerlengo, is Cardinal Kevin Farrell,

Pope Francis's funeral is on Saturday, and now's the time to familiarize yourself with a few Catholic terms and phrases that you will hear this week.

A new pope does not swoop in and openly set about undoing the legacy of another. But a lot can change as far as style, emphasis, guidance and law.