In what kind of system must the winner gain an absolute majority of the votes (50% plus one) rather than just a plurality?

Question

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In a majoritarian system, the winner must have an absolute majority of votes (50% plus one) rather than just a plurality. This ensures that the winner has the support of the majority of voters, rather than just a minority of voters. Minority systems, proportional systems, and single-party systems do not require an absolute majority for the winner.

In What Kind of System Must the Winner Gain an Absolute