If the system is failing and will load only the most essential parts of the operating system and will not run many of the background operating utilities, then the safe mode will occur.
Safe mode refers to the boot option that is available in a computer system in which the operating system starts in diagnostic mode not in a normal operating mode.
It is a tool that is mainly used for troubleshooting a system that has been crashed and facing instability.
Basically, safe mode is a scrutiny mode of a computer operating system.
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