Ranked voting a.k.a “Instant Run-Off Voting,” allows voters to rank up to three candidates, in order of preference, when marking their ballots. It is also called alternative vote (AV), transferable vote, (single-seat) ranked choice voting (RCV), or preferential voting. This voting system is commonly used to elect a single candidate from a field of more than two candidates.In this kind of voting system, voters rank outcomes in a hierarchy on the ordinal scale.
This seems to be the most democratic way of voting, however, it is only employed by several jurisdictions in America. Only San Francisco, San Leandro, and Oakland in California; Portland, Maine; Minneapolis and Saint Paul in Minnesota is using this kind of voting system.