Having different accounts on a shared PC lets multiple people use the same device, all while giving everyone their own sign-in info, plus access to their own files, browser favorites, and desktop settings.
You can add a local user account (an offline account) or Microsoft account for a user to sign in to the PC with.
The user name of an account is used to identify the account in Windows.
This tutorial will show you how to change the name of a local account or Microsoft account in Windows 11.