What is a "plug in"?

What is a "plug in"?

Ian Urquhart (Lead Developer, E-Haus, LLC.) gives expert video advice on: What does "plug and play" mean? and more...

A plug-in's like a little piece of software that's usually related to your web browser. Like if you want to watch video, you're going to need a plug-in so you can do that. So they're usually free and they plug right in to your browser, hence the name.