What is OAuth 2.0?

OAuth 2.0 is an open authorization protocol that enables secure information sharing between web applications without disclosing user credentials, evolving from its predecessor OAuth 1.0 with significant enhancements, such as the introduction of bearer tokens over cryptographic signatures and multiple grant types to cater for varied use cases. Initially developed by Twitter and Google in 2006, OAuth facilitates interoperability among popular platforms like Facebook, Twitter, and Google, allowing users to authorize applications to access specific resources in their accounts. This protocol involves four key roles: the client, the resource owner, the resource server, and the authorization server, each playing a pivotal role in the secure exchange of access tokens through a structured flow. OAuth 2.0's significance lies in its ability to provide secure, scoped, and delegated access to resources, crucial in an era of increasing cloud-based storage and application interconnectivity, while also paving the way for protocols like OpenID Connect, which supports social logins and single sign-on features.

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