A screencast is a digital recording of computer screen output, also known as a video screen capture, often containing audio narration. Although the term screencast dates from 2004, products such as Lotus ScreenCam were used as early as 1994. Early products produced large files and had limited editing features. More recent products support more compact file formats such as Adobe Flash and have more sophisticated editing features, allowing relatively easy changes in sequence, mouse movement, audio, etc.
A screenshot is a picture of a computer screen; a screencast is essentially a movie of the changes over time that a user sees on a computer screen, enhanced with audio narration.
sourc:Wikepedia
I use screencasting tools to make software presentation for years. It's much simpler and clearer to show people how to use the software in the form of video with narration rather than text plus screenshot. The most well-known freeware is Camstudio. If you want more editing and publish options, search for the shareware. Personally I use DemoCreator.
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