system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How a vinyl record works.
gpt
A vinyl record has grooves in it, representing the audio track.  As the record spins, a needle runs over these grooves and picks up the vibration.  The needle's output is then run to an amplifier, where it is then magnified and sent to the speakers, where you hear it as sound.

The changes in the grooves allow for variations in sound.