In Athenian politics, it was important to be good at debating. If you were, you were likely to get people to vote your way. The Athenians did not want any one person to
have too much political influence. It would stop things being democratic. Their way of stopping this was simple.
Each year, there was a chance to vote to ostracise.
If over 6000 votes were cast, the person whose name was on most ostraka had to leave.