One hundred and thirty-three cardinals have sequestered themselves behind the Vatican’s medieval walls for a conclave to elect a successor to Pope Francis.

The cardinals are cut off from the world at the Vatican, between residences and the Sistine Chapel, where they vote in secret — and in silence — beneath Michelangelo’s famed ceiling fresco of the Creation and his monumental “Last Judgment.”

The Associated Press has a livestream here:

The process — fictionalized in the 2024 political thriller “Conclave” — is said to be guided by the Holy Spirit, and is designed to be both contemplative and free from outside interference.

Taking no chances, the Vatican is asking cardinals to hand over their phones for the duration of the conclave and is deactivating cell phone coverage at the Vatican. It is using signal jammers around the Sistine Chapel and the Domus Santa Marta hotel and adjacent residence where the cardinals will sleep, to prevent surveillance and communication with the outside world.

Here are some things to know about the election of the 267th pontiff of the Catholic Church, which has 1.4 billion faithful across the world.

White or black smoke signals?

The electors cast paper ballots, and voting continues until one candidate receives a two-thirds majority, or 89 votes. After voting, ballots are burned in a special stove — black smoke signals no decision, while white smoke means a new pope has been chosen.

A first round produced dark smoke that rose into Wednesday’s night sky, sending a disappointed crowd to disperse in all directions.

Electors must be under 80 years old, and are more geographically diverse than ever. They represent Catholicism’s growing presence in Africa, Asia, and Latin America, as well as its traditional power base in Europe.

What happens after a new pope is chosen?

Once a candidate receives the necessary votes and accepts, he chooses a papal name and enters the “Room of Tears” — named for the emotional weight of the responsibility ahead — to don his papal vestments.

Minutes later, he is introduced to the world from the balcony of St. Peter’s Basilica with the proclamation in Latin: “Annuntio vobis gaudium magnum: Habemus Papam!” (“I bring you tidings of great joy: We have a pope!”)

That will be immediately followed by the revelation of his baptismal name, in Latin, followed by the papal name he has chosen.

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Why does the pope matter beyond the Catholic Church?

Though the pope leads a religious institution, his influence extends far beyond it. Pope John Paul II played a pivotal role in supporting the Solidarity movement in his native Poland and encouraging resistance to Soviet domination in Eastern Europe. His moral leadership was credited by many with helping to hasten the end of the Cold War.

Pope Francis, the first pontiff from Latin America, became a prominent voice on global issues from climate change to migration and economic inequality. He called for compassion toward refugees, warned against the dangers of nationalism, and urged action to protect the planet — stances that resonated well beyond church walls, and at times put him at odds with political leaders.

A name to signal a papal direction

The first sign of the new pope’s priorities will come in the name he chooses.

A Francis II might signal a new pope’s embrace of Francis’ legacy of prioritizing the poor and marginalized; a Pius would hint at a traditionalist restoration.

Associated Press religion coverage receives support through the AP’s collaboration with The Conversation US, with funding from Lilly Endowment Inc. The AP is solely responsible for this content.