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The term digital signal is used to refer to more than one concept. It can refer to discrete-time signals that are digitized, or to the waveform signals in a digital system.

Digital signals are digital representations of discrete-time signals, which are often derived from analog signals.

As a simple example digital signals are like number of people. we can count them as 1, 2, 3, 4,.....etc . We cannot count as 3.5 or 6.75 or ...etc. But analog signals are like their body temperature. It can be 32 or 34.7 or 36.876 etc. They changes in a infinite range. Not digitized as digital signals.

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