Privacy Protection is an optional service to enable a domain's owner to hide their private info (eg Name, Mailing Address, Tel No, Email, etc) from being displayed in WHOIS server. (Here is example of WHOIS search : https://www.whois.com/whois )
This service is crucial, to maintain your personal privacy & avoid spammers from contacting you (by phone/emails).
Below is a sample of search results (WITH and WITHOUT Whois ID Protection service):
WHOIS ID Protection service (RM15) is only OPTIONAL.
If interested, kindly tick 'ID Protection' box below, during your Order :
Please do not hesitate to contact us , if you need further info/assistance.