what is kernal upgradation

What is kernal upgradation?

kernel updation is a process of to upgrade the kernel file with a new or latest version of kernel & use of them as a default kernel.or we can say as 

Kernel updation is upgrading kernel version. To update kernel either you can enroll yourself to the official website of red hat or you can simply download the latest kernel version and then running rpm -u kernel version. But this method is not recommended, it is better to install the new kernel and let the older version of it remain untouched so that you can revert back the changes.
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