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Terminology Description
Digitisation

This is the process of representing an analogue  source as a discrete set of points (samples). As analog sources are continuous in all respects, digitized versions of them are approximations of the assumed values actually represented in the analogue original.

DVD

Optical storage format made ubiquitous in the delivery of standard definition digital video (encoded utilizing MPEG-2). Although DVDs are convenient, they are not recommended for long term preservation.