Answer:
Not Practical and not Possible
Explanation:
Signals are used whenever voice communication is not practical and not possible.
Speech signals are transmitted using telephone channels. The voice signals are transferred using the telephone set to the local telephone exchange and then to the receiving party.
In electronics and telecommunications, the signal is described as any electromagnetic wave or current that transfers information.
This point may now seem trite and obvious although it is quite difficult to comprehend.
I think when you write the word and it is a too advanced word she give synonyms or a short definition.
