That is where you might want to use the plug-ins. Browser plug-ins are applications that enables programs created out of the Web to be full viewed right inside a Web browser such as Netscape or MS Internet Explorer. In particular, they will enable your presentations and documents to be viewed inside Web browsers as you see them inside your development tool. Examples of plug-ins are Acrobat Reader , and Macromedia Shockwave . It helps you choose more specifically which one to use in which case.
External formats are non-Web formats.
Files that have an external format need a plug-in to be viewed on the Web. The following tables compare HTML format and non-Web format. This scoring is an evaluation based on my experience with these tools combined with information from related magazines, books and sites. External formats loads on the Web using browser plug-ins. The speed of the loading then depends on whether the application allows fast loading or not.