Open primaries are a type of electoral system that allows voters to participate in primary elections regardless of their registered political party affiliation. This means that registered Democrats, Republicans, and independents can all vote in the same primary election, enabling a broader range of voters to influence candidate selection. In open primaries, voters can choose which party's primary to participate in on the day of the election. This system aims to encourage higher voter turnout and promote more moderate candidates, as candidates must appeal to a wider audience beyond their party's base.