Playing audio on Web pages
Sound files, which come in a variety of formats, are handled differently and inconsistently by different browsers and on different computers. For some measure of predictability and control, users can bring audio into Dreamweaver by first inserting it into a SWF file (created by Macromedia Flash). The SWF file will be played with the Flash plug-in, which comes with most browsers. Flash is a streaming technology, so audio files can start playing even before the entire file has been completely downloaded.