The percentage of people who show up to cast their ballot in an election is voter turnout. When voter turnout is high, democracies work better.
To calculate voter turnout, political scientists look at the number of registered voters who actually vote at the polls. Low voter turnout is thought to reflect a lack of excitement about the candidates or a feeling that voting doesn't actually matter. Healthy democracies can usually inspire citizens to take part in the voting process, and many countries work to increase voter turnout by making it easy to cast a ballot.