Question

What is Signal? Please answers fast ​

Answer 1

Examples of signals include as temperature over time or space, sound (speech, music, etc) over time, images over space, etc. A signal carries information and contains energy. Different types of signals: Analog signal: a function , continuous in amplitude, of a continuous independent variable 

Answer 2

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A gesture, action, or sound that is used to convey information or instructions, typically by prearrangement between the parties concerned.