libel (harmful statement in a fixed medium, especially writing but also a picture, sign, or electronic broadcast), each of which gives a common law right of action.
“Defamation” is the general term used internationally, and is used in this article where it is not necessary to distinguish between “slander” and “libel”. Libel and slander both require publication. The fundamental distinction between libel and slander lies solely in the form in which the defamatory matter is published. If the offending material is published in some fleeting form, as by spoken words or sounds, sign language, gestures and the like, then this is slander. If it is published in more durable form, for example in written words, film, compact disc (CD), DVD, internet blogging and the like, then it is considered libel.
Source: Wikipedia