Perpetual voting means that you can vote continuously and keep changing your vote whenever you want. Imagine you have a crayon box with many colors. You can keep coloring and changing the colors as many times as you like. Similarly, with perpetual voting, you can keep voting again and again and change your vote every time you want. This type of voting is usually done using the internet or special machines. It is used to make sure that everyone's votes are counted and that people can change their minds if they learn more about the candidates or issues. So, if you don't like your first choice, you can always change your answer and keep voting until you are happy with your choice.