Short for Simple API for XML, an event-based API that, as an alternative to DOM, allows someone to access the contents of an XML document. SAX was originally a Java-only API. The current version supports several programming language environments other then Java.
SAX was developed by the members of the XML-DEV mailing list.
SAX Project General information about SAX, an evolution of the API, and information about the Java API.
SAX, the Simple API for XML This article from the XML Files gives a comprehensive explanation of how XML works.