/dev/kmem vs. /dev/mem

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hi all !

What is the difference between the two ?
Googling for answers I've found the following:
"/dev/mem represents the phyical memory, /dev/kmem represents
the kernel virtual address space".
this doesn't fullfill my hunger. 
if /dev/mem is the physical memory, what is exactly /dev/kmem ?what
does the "kernel virtual address space" means ? isn't the term address
space relevant only to processes (while the kernel enjoys full access
to any memory ?)?

thanks a lot !!
Roy.

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