Same-day registration is a voting process that allows eligible citizens to register to vote and cast their ballots on the same day, typically during early voting periods or on Election Day. This system is designed to increase voter participation by making it easier for individuals to register without needing to complete the process in advance. In states that offer same-day registration, voters must provide valid identification and proof of residency. This can include documents like a driver's license, utility bill, or bank statement. By simplifying the registration process, same-day registration aims to ensure that more people can exercise their right to vote.