Unlocking a Facebook account is the process of regaining access to a Facebook account that has been locked for security reasons. This can happen if Facebook detects suspicious activity on your account, such as multiple failed login attempts or if your account has been hacked.
If your Facebook account has been locked, you will need to provide Facebook with proof of your identity in order to unlock it. You can do this by uploading a photo of your government-issued ID or by providing Facebook with a code that is sent to your phone number or email address.