Digital

In signal processing, this refers to the representation of quantities in discrete units. The information is contained and manipulated as a series of discrete numbers as opposed to an analog representation, where the information is represented as a continuous signal. In practice, even analog signals are usually processed digitally; in that the analog signal is sampled to create a digital signal that can be processed by inherently digital computers. Source: NASA (http://earthobservatory.nasa.gov/Glossary)

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