webcam

Definition:

Webcam is short for web camera. A webcam is a tiny camera that usually attaches to a computer and is designed to capture video of the person using the computer and broadcast it over the Internet, although by no means is this the only use of a webcam. Some laptops now come with a webcam integrated into the laptop's screen casing which prevents the user from having to carry a separate webcam along with their laptop.

Webcams are commonly used in chat applications such as Windows Live Messenger or Skype such that each person chatting can actually see the person they are chatting with.

Here's a word you may not know...

progressive scan

Progessive scan is a method for "painting" a video signal by displaying video lines sequentially (progressively) from top to bottom. This is in contrast to the alternating odd/even method used with an interlaced signal. Progressive scan signals are considered superior to interlaces signals due to their scalability for high definition displays and the absence of quirks sometimes associated with interlaced signals.