Looking for logging into the What Is Authentication site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the What Is Authentication site. After that you can login as usual with your login credentials.
https://searchsecurity.techtarget.com/definition/authentication
https://docs.oracle.com/cd/E17802_01/j2ee/j2ee/1.4/docs/tutorial-update2/doc/Security5.html
https://en.wikipedia.org/wiki/Authentication
https://swoopnow.com/user-authentication/
https://swoopnow.com/website-authentication/
https://www.techopedia.com/definition/342/authentication
https://help.salesforce.com/apex/HTViewHelpDoc?id=security_overview_user.htm
https://thenextweb.com/insider/2016/03/31/5-technologies-will-flip-world-authentication-head/
https://stackoverflow.com/questions/5868786/what-method-should-i-use-for-a-login-authentication-request
https://nordicapis.com/3-common-methods-api-authentication-explained/
https://economictimes.indiatimes.com/definition/authentication
https://hackernoon.com/how-do-you-authenticate-mate-f2b70904cc3a
https://help.twitter.com/en/managing-your-account/two-factor-authentication