What is the voting system that you use in Ireland called?

The voting system used in Ireland is called single transferable vote (STV). STV is a proportional representation system that is used to elect members to the Irish parliament, the Dáil Éireann. In STV, voters rank candidates in order of preference. The candidate with the most first-preference votes is elected, and then the surplus votes from that candidate are transferred to the next-highest-ranked candidate on each ballot. This process continues until all of the seats in the Dáil Éireann have been filled.

STV is considered to be a fair and proportional voting system because it allows voters to express their preferences for more than one candidate. It also encourages candidates to appeal to a broad range of voters, rather than just focusing on a small group of loyal supporters.

STV is used in a number of other countries around the world, including Australia, Malta, and New Zealand.