ID Protect is a domain addon which provides privacy for your Whois info that pertains to your domain. When a domain name is registered, the registrant enters personal contact information such as their name, address, email, phone number, etc. This information is publicly available in the global WHOIS database.
The ID Protect service will replace your personal information that is required to register a domain name with information from an entity known as WHOISGUARD, INC. While your personal info is required to register the domain name, with the ID Protection addon, none of your information will be added to the public database.
At checkout, make sure to select the ID Protect addon to ensure your information is hidden.