A screencast is nothing more than a digital recording of one’s computer screen, which is usually accompanied by some sort of audio narration that explains what’s  happening. Screencasts are useful because they allow you to demonstrate a specific activity or teach others how to perform a particular task, which might otherwise be too cumbersome to explain over the phone or through chat. Another useful way to use screencasts is to record a presentation, which can then be uploaded as a video (youtube), downloaded as a movie file, or  shared via a link.

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