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                   Signals
When data is sent over physical medium it needs to be first converted into electromagnetic signals. Data itself can
be analog such as human voice, or digital such as file on the disk. Data (both analog and digital) can be
represented in digital or analog signals.
 Digital Signals
Digital signals are discrete in nature and represents sequence of voltage pulses. Digital signals are used within
the circuitry of a computer system.
 Analog Signals
Analog signals are in continuous wave
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