It means that some people will be able to force others to vote a certain way, punish them if they don't vote a certain way, or even pay them for their votes. Th

It means that some people will be able to force others to vote a certain way, punish them if they don't vote a certain way, or even pay them for their votes. Those schemes are a lot less effective when you can't prove how someone voted. People can try to bribe you, or even intimidate you, but once you're in the voting booth you have the freedom to vote however you want and nobody can find out later which way you actually voted. That freedom is very important and worth keeping. You already know which way you voted, no one else needs to be able to check.