Hello, seeing PSA about update for existing users, could anyone explain the `initramfs` thing for me

Hello, seeing PSA about update for existing users, could anyone explain the initramfs thing for me? What is it for? If i disable it prior updating, should i enable it after update is done? What happens if i do not disable it? If i keep it disabled, will i have any issues? I understand it has something to do with external GPUs? If so, if i do not use it, then i can keep it disabled? But why is it then enabled by default?
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