Runoff voting

Runoff voting can refer to:

• Two-round system, a voting system used to elect a single winner, whereby only two candidates from the first round continue to the second round, where one candidate will win.
• 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).