+A **sensor** is a device that detects and responds to physical input from its environment. It converts stimuli, such as [light](/wiki/light) or [pressure](/wiki/pressure), into a measurable [electrical signal](/wiki/electrical_signal) for processing.
+## See also
+- [Actuator](/wiki/actuator)
+- [Transducer](/wiki/transducer)
+- [Measurement](/wiki/measurement)
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