Activation doubt on reinstallation

[Microsoft Windows]

so iam currently using windows11 and i have no disk space and going to remove windows completely and install linux. since if i completely remove windows the windows activation key would be gone right and when i decide to switch to windows again would my activation be there or not? if yes no problem if no, can i extract that activation key now itself and use that later?,or how to do that? please guide!

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