YouTube has launched a new "account lock" feature, allowing users to secure their profiles on shared TVs with a four-digit code.

• A four-digit code locks your YouTube profile on a specific TV, preventing others from accessing your watch history, subscriptions, and personalized recommendations.
• This feature is rolling out globally to most smart TVs, streaming devices, and game consoles.
• The account lock is device-specific and does not replace your main Google account password.