we want to begin by stating that this is not a dumb question and you should never hesitate to post any questions you may have.  That being said, a metronome is any device that produces a regulated aural, visual or tactile pulse to establish a steady tempo.  It is most commonly used in an exercise setting for assessment tests like the Kasch Pulse Recovery step test or 3 Minute step test.

We hope this helps.  Don't ever hesitate to contact us with any questions you may have as you study.  Take care and have a great night.