A transducer is a device capable of transforming or converting a certain manifestation of input energy into a different output energy,[1]​ but of very small values ​​in relative terms with respect to a generator.[2]​.

The type of transducer indicates what transformation it performs (for example, electromechanical, it transforms an electrical signal into a mechanical one or vice versa). It is a device used mainly in industry, medicine, agriculture, robotics, aeronautics, etc., to obtain information from physical and chemical environments and obtain (from this information) electrical signals or impulses or vice versa. Transducers always consume a certain amount of energy, which is why the measured signal is attenuated.

There are two types of transducers: sensors and actuators:.