what is kernel space and user space ?

In computer operating system , virtual memory is divided into two parts , user space and kernel space.
Kernel space has extra security. So, only kernel runs in this space with supervisor mode. As user space doesn’t have any security , so kernel runs in user space as well.

User applications runs with limited privilege , and each application has its own virtual memory space. So, it runs only in user space.
User application gets the service from kernel using, system calls.

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