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A discrete signal or discrete-time signal is a time series consisting of a sequence of quantities.

Discrete signal is a type series that is a function over a domain of discrete integral.

Unlike a continuous-time signal, a discrete-time signal is a function of a continuous argument. However, it may have been obtained by sampling a continuous-time signal, and then each value in the sequence is called a sample. When a discrete-time signal obtained by sampling is a sequence corresponding to uniformly spaced times, it has an associated sampling rate; the sampling rate is not apparent in the data sequence, and so needs to be associated as a separate data item.

Source: Wikipedia.