In the past, the law divided defamation into 2 categories: libel and slander. Libel is the publication of defamatory matter in permanent form, while slander is the publication of defamatory matter in non-permanent form. Something defamatory that is printed in a newspaper or book was called libel, but the same thing, if spoken, was called slander. Under the Broadcasting Services Act 1992 (Cth), the publication of defamatory matter over radio or television is deemed to be in permanent form and is, therefore, libel [s 206].

The Defamation Act 2005 (SA) abolishes the distinction between slander and libel. The publication of defamatory matter of any kind is actionable [s 7].