text: In electoral systems, voter registration (or enrollment) is the requirement that a person otherwise eligible to vote must register (or enroll) on an electoral roll, which is usually a prerequisite for being entitled or permitted to vote.
  The rules governing registration vary between jurisdictions. In many jurisdictions, registration is an automatic process performed by extracting the names of voting age residents of a precinct from a general-use population registry ahead of election day. In contrast, in others, registration may require an application being made by an eligible voter and registered persons to re-register or update registration details when they change residence or other relevant information changes.