Data is propagated from one point to another by means of electrical signals, which may be in the digital or analog form. As shown in the figure below,
analog signals are continuous in nature. They have continuous amplitude levels. Since they are continuous, it is very difficult to remove physically any noise and distortion from them, which is added during transmission or otherwise. The telephone lines used for data communication in computer networks are usually meant for carrying analog signals.
A digital signal is a sequence of voltage pulses represented in the binary form. These signals are well-defined with discrete amplitude levels. Computer generated data is digital in form.
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