(ICT) An extra piece of software that a Web Browser needs to run certain elements of a Web page. Web pages incorporating multimedia files often need to use Flash Player, QuickTime, RealPlayer or Shockwave Player as plug-ins. Sites that require a plug-in usually provide a link to a site from which the essential plug-in can be downloaded. See: Section 6.8, Module 1.5, headed Do you need plug-ins?