The best explanation for the purpose of voter registration is that it helps to prevent voter fraud in elections. By requiring citizens to register to vote, it ensures that only eligible individuals cast their vote and prevents any fraudulent activity like individuals voting multiple times or non-citizens voting. Voter registration helps maintain the integrity and fairness of the electoral process by ensuring that each voter is verified and meets the necessary requirements to participate in an election. To find this answer, you can understand the purpose of voter registration by considering the primary goal it serves in the electoral system.