Issue
I am trying to learn how to make my own os from osdev's wiki, but somewhere there it says that I have to use the grub-mkrescue command. I was doing some research around internet to understand what does that command do and found in the grub official documentation this sentence:
The program grub-mkrescue generates a bootable GRUB rescue image
What is a rescue image?
Solution
A rescue image can be used to restore your computer. This can be used to create restore points that you can go back to, or as a backup in case your hard drive goes bad. It's similar to an ISO image which is used to create the OS. See this article for more info.
Answered By - hostingutilities.com