The candidate with the majority (more than 50%) of first-choice votes wins outright. If no candidate gets a majority of first-choice votes, then it triggers a new counting process.
The candidate who did the worst is eliminated, and that candidate’s voters’ ballots are redistributed to their second-choice pick.In other words, if you ranked a losing candidate as your first choice, and the candidate is eliminated, then your vote still counts: it just moves to your second-choice candidate.
That process continues until there is a candidate who has the majority of votes.
Need more? Check out this video!