User space and kernel space
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A modern computer operating system usually segregates virtual memory into user space and kernel space.[lower-alpha 1] Primarily, this separation serves to provide memory protection and hardware protection from malicious or errant software behaviour.
Way of using computer memory
Kernel space is strictly reserved for running a privileged operating system kernel, kernel extensions, and most device drivers. In contrast, user space is the memory area where application software and some drivers execute.