These are settings you can use on social media and games to control who can be your friend, who can see your information and who can chat to you. For new accounts on some apps these are automatically set to be more public than private.
These settings can sometimes be complicated so it is always a good idea to ask a trusted adult to help you find and use these settings.
Being truthful about your age when creating an account can also help you protect your information – some apps and games have extra settings to help children be more private.