Other forms: voters
If you cast your ballot during an election, you're a voter. In a presidential primary, voters from each major party choose a candidate to run in the general election.
A voter, simply put, is either someone who's eligible to vote in an election or someone who actually does vote. When a candidate addresses voters, they're speaking to a group of people, trying to convince that group to vote for them. When voters pass an ordinance or approve a school budget, that means that the majority of those who voted made those choices. The Latin root of both voter and vote is vovere, "to promise."