What is the difference between signal and wave?
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wave is a movement in time in a medium. It needs a medium . The energy is transferred due to this movement in the medium. In such a case , it is called a wave. For eg: Electromagnetic waves, light waves.
Whereas a signal signifies something. It carries information in the wave. Eg: In Band signalling, out band signalling, dialling signal etc.-it signals the receiving device to do something with what it receives.
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