What is Domain Privacy?
When you register a domain name, the registration details are available online in public WHOIS database. It is always a good idea to add Domain Privacy for your domains so that your personal information will not be public when someone does a WHOIS search.
Otherwise, it is easy for anyone with internet access to see your personal information including your name, address, telephone and email. It can be used by scammers looking to steal or transfer your domain name. You can choose to have Domain Privacy so that nobody can see this information whilst you retain full rights over your domain.
Here is an example: