A
plug-in is a separate application program that enhances and adds capabilities to your Web browser so that it is able to interact with multimedia on the Web.Plug-ins make it possible to listen to
streaming audio and to watch streaming video. They also provide Internet telephone which allows you to speak with other people over the Web.Plug-ins can display
documents with the quality of desktop publishing. You can also explore three-dimensional multimedia environments.In short, plug-ins allow you to access the new technologies on different Web pages.