What is OAuth2?
OAuth2 is an open standard authorization protocol or framework that provides applications with the ability to provide “secure, authenticated access.”

OAuth2 does not share password data, but uses authorization tokens to prove an identity between consumers and service providers. OAuth2 is an authentication protocol that allows you to authorize the interaction of one application with another on your behalf without revealing your password.

Authorization is about asking permission to do something, while authentication is about proving that you are the right person.

OAuth2 does not transfer authentication data between consumers and service providers.

OAuth defines four roles
1. Resource owner: The resource owner is the user who authorizes an application to access his or her account. The application's access to the user's account is limited to the scope of the authorization granted (e.g. read or write access).
2. Client: The client is the application that wants to access the user account. Before it can do so, it must be authorized by the user and the authorization must be confirmed by the API.
3. Resource Server: The resource server hosts the protected user accounts.
4. Authorization server: The authorization server verifies the user's identity and then issues access tokens for the application.

Example 1: You can tell Facebook to allow ESPN.com to access your profile or post updates to your timeline without telling ESPN your Facebook password.

Example 2 – An OAuth2 is like this valet key. You can give each consumer of your data a different valet key. Consumers will never have the full access key to your profile data or private data. But this gives them limited access to perform the operation without sharing the password.

#OAuth2 #Authentication #Authorization

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