Computer Hardware And Software : What is a "plug in"?

Ian Urquhart (Lead Developer, E-Haus, LLC.) gives expert video advice on: How do I choose a DVD or CD burner? | How do I choose the best monitor for my needs? | What does "plug and play" mean? | How do I choose the best speaker system for my computer? | What is the difference between an ink jet and laser jet printer and how do I know which one is the best choice for me? and more...