+A **signal** is a function that conveys information about a phenomenon. It can be a physical quantity, like an [Electric Current](/wiki/electric_current), or a more abstract message, often modulated for transmission across a [Medium](/wiki/medium). Signals are fundamental to communication, control, and data processing.
+## See also
+- [Information](/wiki/information)
+- [Communication](/wiki/communication)
+- [Data](/wiki/data)
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