A PIN is an additional security feature available in Windows 10 and Windows 8.1 to protect your user account and all the sensitive data inside it. When enabled, it can be entered instead of the password. Unlike a password, a PIN does not require the user to press the Enter key when logging in and it is a short 4 digit number. Once you enter the correct PIN, you will be immediately signed in to your Windows 10 account.
If you need to remove your PIN, here is it can be done in Windows 10.
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