A third-party program, such as adobe flash player, is considered to be a(n) "plug-in".
A plug-in (add-in, add-on, or extension) refers to a software component, in computing that adds a particular element to a current PC program. At the point when a program supports plug-ins, it empowers customization. The basic cases are the plug-ins that are utilized as a part of web programs to include new highlights, surely understood program plug-ins incorporate the Adobe Flash Player, the QuickTime Player, and the Java module etc.