Jitter is a time-based signal error.  Often misunderstood, this problem can range from subtle and nearly inaudible to loud and distracting.  Jitter can reduce low-level resolution (add noise) and add distortion.

SINCE THE 1990's AND THE ADVENT OF BROAD DISTRIBUTION OF DIGITAL AUDIO, POPULAR MUSIC HAS STEADILY BEEN CREEPING LOUDER AND LOUDER.  DIGITAL AUDIO MUST BE COMPRESSED

AFTER PEAK AMPLITUDE IS REACHED (AT 0DBFS) TO BECOME LOUDER.  HAVE YOU EVER RECEIVED AN EMAIL OR TEXT MESSAGE THAT LOOKS LIKE THIS?  It's just a bit obnoxious, isn't it?