Answer:
Signal words give hints about what is about to happen in what you're reading. Understanding them is a key to comprehension. Reading and making up examples which use them is a good way to understand them at whatever level of abstraction a student is prepared to comprehend.
Explanation:
Because In signal processing, a signal is a function that conveys information about a phenomenon. In electronics and telecommunications, it refers to any time varying voltage, current or electromagnetic wave that carries information. A signal may also be defined as an observable change in a quality such as quantity.
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