 To exploit someone is to take unfair advantage of them. It is to use another person’s vulnerability for one’s own benefit. Of course, benefitting from another’s vulnerability is not always morally wrong—we do not condemn a chess player for exploiting a weakness in his opponent’s defence, for instance. But some forms of advantage-taking do seem to be clearly wrong, and it is this normative sense of exploitation that is of primary interest to moral and political philosophers.