Webmasters need to know about the law of defamation, because material published on a website can give rise to claims of defamation. Even material published by others on your website can cause problems. This short article explains the key points of the law. It covers the basic question of what is defamatory, the old distinction between libel and slander, the idea of "publication", the question of whether you can defame a company, and much else besides. Learn how to avoid being sued for defamation, and find out whether others' publications about you may be actionable.