olemus
protsess, millega veebisait kontrollib väidetavat identiteeti
= any process by which a Website verifies that someone is who he claims he is

ülevaateid
https://en.wikipedia.org/wiki/HTTP%2BHTML_form-based_authentication
https://swoopnow.com/website-authentication/
https://blog.risingstack.com/web-authentication-methods-explained/
https://www.loginradius.com/blog/async/website-authentication-protocols/

vt ka
- autentimine
- pääsu reguleerimine