What is a Plug-In

What is a Plug-In?

A plug-in is an application program that is invoked by the browser.

A plug-in is part of the browser binary tree and runs inside of the browser window. It cannot live on its own.

Examples of plug-ins include RealAudio and Shockwave.

So a helper application has a mind of its own, and a plug-in is literally plugged into the browser.

Got it! What is an URL?