You probably would have heard the word OAuth more than a few times. Ever wondered what that is? do we use that at all?. Guess what we make use of OAuth almost everyday.I got the opportunity to learn about OAuth during my time at WSO2 Identity Server team. Here's the first step of conquering OAuth :) What Exactly is OAuth? Let me start with OAuth, OAuth solves the problem of allowing third party entities( eg: applications) to access a resource owner's protected resources without actually giving away your valuable credentials like passwords. Let's think of it this way. You have a facebook account(Assuming you have one :P) which is your protected resource and you are the resource owner . Now you get a little high and decide to try out one of these fancy Facebook apps that finds your soul mate. The app now becomes the third party application which requires access to read out your friend list from your profile which is the protected resource. Suppose you don't hav