interlaced

Definition:

Interlaced is a method for "painting" a video signal by displaying video lines in an alternating (odd lines then even lines) pattern. Interlaced signals are considered inferior to the newer progressive scan method of displaying a video signal.

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screencast

A screencast is a video mimicking what appears on someone's computer screen. Screencasts are often used in computer training to provide step by step instructions to make it easy for noobies to learn new technologies.