Under universal automatic registration, the state places all eligible citizens on the electoral roll using existing government data, without requiring any action from citizens. Sweden, Denmark, and Germany operate versions of this system through national population registers.
Under active registration with proof of eligibility, citizens must take positive steps to register and provide documentation such as proof of citizenship, identity, or residency; before being added to the roll. India and the United States have historically operated versions of this system, with requirements varying significantly by state