Answer Posted / masoud
Kernel Mode
In Kernel mode, the executing code has complete and
unrestricted access to the underlying hardware. It can
execute any CPU instruction and reference any memory
address. Kernel mode is generally reserved for the
lowest-level, most trusted functions of the operating
system. Crashes in kernel mode are catastrophic; they will
halt the entire PC.
User Mode
In User mode, the executing code has no ability to directly
access hardware or reference memory. Code running in user
mode must delegate to system APIs to access hardware or
memory. Due to the protection afforded by this sort of
isolation, crashes in user mode are always recoverable. Most
of the code running on your computer will execute in user mode.
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