Different types of electoral systems used worldwide include first-past-the-post, proportional representation, and ranked-choice voting. First-past-the-post allows the candidate with the most votes to win, often leading to a two-party system. Proportional representation allocates seats based on the percentage of votes received, promoting multi-party systems and reflecting a broader spectrum of public preferences. Ranked-choice voting enables voters to rank candidates, encouraging genuine preferences and potentially reducing negative campaigning. Each system has its implications for representation, voter engagement, and political stability.