Runoff voting explained

Runoff voting can refer to:

• Sequential-loser methods based on plurality voting:
  • Two-round system, a voting system where only the top two candidates from the first round continue to the second round.
  • Instant-runoff voting, an electoral system where last-place candidates are eliminated one by one until only one candidate is left.
    • Contingent vote, an instant-runoff (preferential, single round) version of the two-round system.
    • Exhaustive ballot, an iterated voting system where rounds of voting are held sequentially (rather than simultaneously, as in IRV).