Conclave: Here is how a Pope is elected
If still no Pope is elected after 21 votes, a final pause for prayer, dialogue, and reflection is observed

As Catholic cardinals enter the conclave at the Vatican in Rome to elect a new Pope following the recent death of Pope Francis, here is how the process is conducted:
“Eligo in Summum Pontificem” (“I elect as Supreme Pontiff”.)
The ballot for each of the 133 cardinal electors will have these words as they choose the 267th Roman Catholic leader.
The ballot is rectangular, with half of it having a Latin Phrase, with the bottom half left blank for the cardinals to write the name of the candidate they’ll be voting for.
Its design allows folding in half, described as Universi Dominici Gregis by the Apostolic Constitution.
The cardinals receive at least two or three ballots, which are distributed by the ceremonial officer, then the senior cardinal deacon draws lots to appoint three infirmarii who collect the ballots from the cardinals, three scrutineers to count the votes, and three revisers who verify the counting.
In the pre-scrutiny stage, if those selected for the above roles are unable to conduct them, new names are drawn in their place.
The voting begins when all the non-voters leave the Sistine Chapel.
The senior cardinal deacon then closes the doors, opening and closing them only as needed, such as when the infirmarii go to collect the votes of ill cardinals and return.
During the voting, each cardinal in order of precedence writes their candidate’s name on the ballot, folds it, holds it aloft for visibility, and then carries it to the altar where a Chalice is placed with a plate covering it.
The elector says aloud in Italian: Chiamo a testimone Cristo Signore, il quale mi giudicherà, che il mio voto è dato a colui che, secondo Dio, ritengo debba essere eletto” translated as “I call as my witness Christ the Lord, who will be my judge, that my vote is given to the one whom I believe should be elected according to God”).
After the loud pronunciations, the cardinals then place the ballot on the plate and uses it to drop the vote into the chalice, bows to the altar, and return to their seat.
Electors present but unable to walk to the altar due to illness give their folded ballot to one of the scrutineers, who brings it to the altar and deposits it in the same manner, without reciting the oath again.
If any cardinals are too ill to be in the chapel, the three infirmarii visit them with a tray of ballots and a sealed box (previously shown to be empty, then locked with the key placed on the altar).
The top of the box has a slit where the folded ballots can be inserted.
Once the votes are cast, the infirmarii bring the box back to the chapel, where it is opened in front of the electors.
After all votes have been cast, the first scrutineer shakes the chalice to mix the ballots. The last scrutineer then counts them one by one, transferring them into a second, empty container.
If the number of ballots doesn’t match the number of voters, all ballots are burned, and a new vote is held immediately.
If the count is correct, the ballots are opened and read.
The three scrutineers sit at a table before the altar.
The first reads the name written on a ballot and passes it to the second, who confirms the name and hands it to the third, who reads it aloud for everyone to hear and records the vote.
If two ballots appear to be written by the same person and bear the same name, they count as one vote. If they show different names, both are invalid, though the overall vote remains valid.
Once all ballots have been read and the votes tallied, the final scrutineer pierces each ballot with a needle through the word Eligo and threads them together with string.
The ends of the string are tied in a knot, and the ballots are stored for safekeeping.
Once the Pope is elected, he is led to the “Room of Tears,” which is next to the Sistine Chapel, where for the first time, he dons in the Papacy vestments.
To elect a new Pope, a two-thirds majority is required. For the upcoming conclave on Wednesday, 7 May, that means at least 89 votes are needed out of 133 electors.
Regardless of whether a Pope is elected, the revisers carefully verify the count and check the notes made by the scrutineers to ensure everything was carried out correctly.
After this, before the electors leave the Sistine Chapel, all the ballots are burned in a cast-iron stove first used in the 1939 conclave.
The scrutineers handle this with help from the College secretary and the ceremonial officers, who are summoned by the senior deacon.
The votes are counted and added to those already in the main chalice.
A second stove, installed in 2005, is connected to a chimney visible from St Peter’s Square.
This is where the chemicals are added to colour the smoke: black if no Pope has been elected, white if one has.
If two votes are held in succession, the ballots from both are burned together at the end of the second round.
Voting occurs four times daily – twice in the morning, twice in the afternoon.
If, after three days, no candidate has been chosen, voting is paused for one day of prayer, informal discussions, and a brief spiritual exhortation by the senior cardinal deacon.
Voting then resumes. After every seven additional rounds without success, another pause and exhortation follow – first by the senior cardinal priest, and later, if necessary, by the senior cardinal bishop.
If still no Pope is elected after 21 votes, a final pause for prayer, dialogue, and reflection is observed. At this point, voting continues, but the cardinals may only choose between the two candidates who received the most votes in the previous round.
Even then, a two-thirds majority is still required, and the two candidates in question are not allowed to vote.