What does pin is locked mean Roblox?

What does pin is locked mean Roblox? Parents and users have the option to add a four-digit PIN to lock the account. Once a PIN is added, it will be needed to make any changes to the account settings. This feature prevents changing the password, email address, and privacy and settings.

Parents and users have the option to add a four-digit PIN to lock the account. Once a PIN is added, it will be needed to make any changes to the account settings. This feature prevents changing the password, email address, and privacy and settings.