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If you mean a unix/linux kernel or embedded kernel, it's a copy of all the code & data an OS uses to interact with devices and provide streams of i/o to user-level shells.
It stays "in-memory" which is why linux runs best with lots of RAM and swap space,
The embedded versions are usually in ROM with some scratch file RAM onboard.
hi folks please go to this link for more information .<a href="https://en.wikipedia.org/wiki/Kernel_(computing)" target="_blank" rel="nofollow noopener noreferrer">Kernel (Computing)</a> 😀