Auth0 provides different mechanisms like SAML, OAuth, OIDC, and WS-Fed. I have looked into OAuth and will cover that today. Before jumping into implementation let’s talk about basic terms which are used in the implementation. — Identity is something that proves who you are. e.g. if you have booked a flight and show up at an airport they would check your passport and hence proves that you are the one who the ticket is booked for and they compare the Given name, surname, passport number, etc.