If you previously had an activated version of Windows 10 on your PC and performed a clean reinstall, you don’t need a key at all.
If you bought a PC that came with Windows but you can't find the key, it’s likely embedded in your hardware (BIOS/UEFI). You can find it for free using a simple command: windows-10-product-keys-free
You get the full operating system and security updates indefinitely. If you previously had an activated version of
Microsoft recognizes your motherboard. Once you connect to the internet, Windows will automatically activate using your existing digital license . windows-10-product-keys-free