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Capture is the process of acquiring data for use at some later date, usually by converting an analog signal into a digital one, such as a video capture card converting a TV signal to digital video. A screen capture also refers to taking a picture of what is on a computer screen.
Capture refers to taking analog data and converting it into digital. One of the most obvious uses is video capture. A video capture card might take a video signal coming over the air or from a VCR and convert it into a digital format, such as MP4 for later viewing and editing. Similarly, audio capture refers to digitally recording analog audio. A screen capture refers to taking a picture of a computer screen, to show a computer program in action or to show off one’s desktop customizations.