Runoff voting can refer to: Election methods where candidates are eliminated based on a comparison of vote tallies: 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 votes rank candidates and if necessary last-place candidates are eliminated one by one until one candidate has a majority of votes. Contingent vote, a preferential ballot version of the two-round system. Exhaustive ballot, an iterated voting system where, if necessary, numerous rounds of voting are held sequentially. Last-place candidates are eliminated one by one until a round of voting sees a candidate receive a majority of votes.