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A kernel is the core of an Operating System. It provides basic services for all other components of the OS. It is the main layer between the OS and hardware, and it helps with process and memory management, file systems, device control, and networking. Following is Linux  Kernel Architecture : User Space is the memory area where all user mode applications works and this memory can be swapped out when needed. Userspace process normally runs in its own virtual memory space and unless explicitly requested, cannot access the memory of other processes. Due to the protection afforded by this sort of isolation, crashes in user mode are always recoverable. Kernel Space is strictly reserved for running the kernel, OS background process, kernel extensions and device drivers. In Linux kernel space gives full access to the hardware, although some extensions runs in the user space. Crashes in kernel mode are catastrophic; they will halt the entire PC. These two modes are enforced...