Voters rank the candidates in order of preference, with "1" being the highes (most preferred) ranking. For example, if there are 3 candidates, the voter chooses 1 beside their first choice, 2 beside their second choice and 3 beside their third choice.
To be considered a valid ballot, the submitted ballot must satisfy the following conditions:
The first preference on each ballot count as a vote for that particular candidate, and the votes are tallied. If no candidate receives a majority (greater that 50% of the total valid ballots), the ballots for that candidate are redistributed to each ballot's second preference. The process continues until a majority is rached by one of the candidates.
Note: There are many variants of winner election that can also done with this method, including Single Transferable Vote (STV) The Voting Vault provides voting details while keeping voters anonymous so that you can select your own winned.