What is WHOIS?
All registered domain names are entered and saved into a centralized database which has the personal contact information for the domain registrant. This database is called the WHOIS database. It is required by ICANN that all domains contain valid and up to date information for WHOIS search.
It is important to have accurate information in the WHOIS lookup because it is needed for domain name transfers and by the general public to determine who owns what domain as well as the expiration date.
Will my contact details be seen by everyone?
Absolutely. ICANN requires that all domains have valid contact information. Domain Privacy allows for private registration of contact information in the WHOIS database. This blocks you from spam and other advertisements.