A more thorough explanation:

Definition: Two-round voting is a system in which the voting occurs in two rounds, with the first round determining the candidate's eligibility for the second round. The second round may be a runoff between the top two candidates from the first round, an election by plurality among candidates who won their political parties' nominations in the first round, or an election by plurality among the candidates from the first round who reached a certain threshold.

Example: In a presidential election, if no candidate receives a majority of the votes in the first round, a second round of voting is held between the top two candidates from the first round. This is an example of two-round voting.

Explanation: Two-round voting is used in many countries to ensure that the winning candidate has a majority of the votes. In the first round, voters can choose from a variety of candidates. If no candidate receives a majority of the votes, a second round is held between the top two candidates from the first round. This ensures that the winning candidate has the support of a majority of the voters.