Voltage and current are few time varying quantities that are used to represent data, by varying these quantities with respect to time data can be transmitted. Here the data is converted into electromagnetic signal either as analog or digital and sent from sender to receiver. Signal is an electromagnetic wave that carries information through physical medium. In other words signal is a function that represents information or data. Similarly signal is a way of communicating by sending information from one system to other system. Gestures, actions, sounds, expressions tell us some information, and these are the ways of communicating one to other.
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