Whats the meaning of "redacted for privacy"

for some reason I have to check owner and information of a site .

I check this address https://haveibeenpwned.com/ In whois.icann.org

but the answer wonder me

who can explain

Contact Information
Registrant Contact

Name: REDACTED FOR PRIVACY
Organization: REDACTED FOR PRIVACY
Mailing Address: REDACTED FOR PRIVACY, REDACTED FOR PRIVACY REDACTED FOR PRIVACY REDACTED FOR PRIVACY REDACTED FOR PRIVACY
Phone: REDACTED FOR PRIVACY
Ext:
Fax: REDACTED FOR PRIVACY