WHOIS manages all data regarding domain registration. All registrant details are considered public information, in addition to the nameservers and other simple details regarding domain registrations (e.g. registration, renewal, and expiry dates). If someone knows a registered domain name, they can try to search public information in the Web.
WPP is "WHOIS Privacy Protection" that hide your personal name, address, phone, email, and business name. Instead, a generic registrar-generated information set is displayed.
In column "AJ" you can find the availability (yes / no) of the WPP service for this TLD is supported.