OAuth 1.0a
OAuth 1.0a is an open standard for secure authorization that allows third-party applications to access user resources on a server without exposing user credentials. It provides a method for users to grant limited access to their data on one site to another site, using cryptographic signatures for security. This protocol is widely used for API authentication in web and mobile applications.
Developers should learn OAuth 1.0a when building applications that need to securely interact with APIs that require user authorization, such as social media integrations or data-sharing services. It is particularly useful in scenarios where user consent is needed for accessing protected resources, ensuring that credentials are not shared directly. However, note that OAuth 2.0 has largely superseded it in modern applications due to improved simplicity and flexibility.