The blue screen of death (BSOD) was initially designed to grab attention with its stark blue background and cryptic warning.A programmer added a hidden Easter egg message as a joke, but it was rarely seen by users due to the quick appearance of the BSOD.The BSOD appears when Windows encounters a critical error that it cannot recover from.Although it may not be as common or terrifying as before, the BSOD remains an iconic part of Windows history.