system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's the purpose of screensavers?
gpt
Back in the day of CRT displays if you left an image in place long enough it would burn into the phosphors on the front of the display.  So instead of turning it on/off (which also causes problems) when you walk away for 5 mins they would blank the screen.

Then someone got the idea of displaying something (probably to let people know it was still on) and then people used it as a venue for funny shit (e.g. After Dark).

LCD/LED displays don't really need screen savers other than to shut off the inverter (via DPMS).