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Also: you never need to erase and reinstall the OS. It's on a read-only, cryptographically signed secure disk volume, and won't boot if it's been altered. At most, you can just erase all user content (the "Data" volume) in System Settings. However, clean installing is rarely necessary -- and pointless if you restore everything!
Thanks. Is this true for iOS (or any Apple OS) as well?
 
Thanks. Is this true for iOS (or any Apple OS) as well?
You can't erase the OS on an iPhone or iPad. There's no "recovery" OS to run from; no disk utility, etc.

And yes: macOS has got more like iOS in this regard. All your data, apps and settings are entirely separate from the OS, and you can erase your data, leaving the phone in a 'factory' state.
 
You can't erase the OS on an iPhone or iPad. There's no "recovery" OS to run from; no disk utility, etc.

And yes: macOS has got more like iOS in this regard. All your data, apps and settings are entirely separate from the OS, and you can erase your data, leaving the phone in a 'factory' state.
Just as a point of clarity: the Erase all Content and Settings option is only available on Apple Silicon and T2-equipped Macs running Monterey or later. For other computers, you do need to do an erase and reinstall to get a fully clean disk. https://support.apple.com/en-us/102664
 
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For other computers, you do need to do an erase and reinstall to get a fully clean disk.
Good point. But even then, unless you're selling it, there is very little need to wipe the disk, particularly if you're going to put everything back. But I digress...
 
Any recommendations for a cheap and reliable website for an Office 2021 key?
you can buy it from vipcdkeys .com, they sell retail products at very cheap price, once I brought a windows 11 key at only 19 bucks, till now it working fine, so if you want you can check them
 
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