Voter registration is the requirement in some democracies for citizens and residents to check in with some central registry specifically for the purpose of being allowed to vote in elections. An effort to get people to register is known as a voter registration drive.
In various countries, including most developed countries, registration is the responsibility of the government, either local or national; and in over 30 countries some form of compulsory voting is required as part of each citizen's civic duty. Even in many countries where the voting itself is not compulsory, registering one's place of residence with some government agency is required, which automatically constitutes voter registration for citizens, and in some cases residents, of the required age. In other countries, however, people eligible to vote must "opt in" to be permitted to participate in voting, generally by filling out a specific form registering them to vote. Governments registering people has been shown to be one of the most powerful predictors of high voting turnout levels.