The blue screen of death (BSoD) – or blue screen error, blue screen, fatal error, bugcheck, and officially known as a stop error[1][2][3] – is a critical error screen displayed by the Microsoft Windows operating systems to indicate a system crash, in which the operating system reaches a critical condition where it can no longer operate safely.
Possible issues that may cause a BSoD include hardware failures, an issue with or without a device driver, viruses, malware, and other factors such as intentional user action.