Shuffled your playlist
Prevented songs from skipping
Changed your equalizer profile
Protected against electrostatic shock
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Correct Answer: Prevented songs from skipping

Learn why this is the correct answer

First appearing in the mid-90s, the ESP (Electronic Skip Protection or Electronic Shock Protection) button enabled a data buffering feature on portable CD players to help prevent audio playback from skipping when the device would experience physical shock such as being in your pocket during a jog.

When activated, audio would be stored in RAM before being piped through the digital-to-analog converter, giving the CD player time to find where it left off reading and allowing playback to continue when it would otherwise skip.

Early on, the feature could only buffer about three seconds and naturally faded out of necessity amid the rise of flash-based MP3 players.