A Burn-in test is a test where a system (an IT system or not), or a particular component, is kept powered on for a long time while performing intensive tasks in order to identify potential problems due to use.

With respects to the video world, a Burn-In or "Ghostsing" phenomen happens when an image, statically shown on the display for a long time, is then permanently visible as a "ghost" superimposed to the following images.