OAuth (Open Authorization) is an open standard for access delegation, enabling a user to grant a third-party application limited access to their resources on another service without exposing their primary login credentials. Instead of sharing passwords, users authorize access, and the service issues access tokens that define specific permissions and durations for the third-party app. This mechanism provides a secure and standardized way for applications to interact with user data, greatly enhancing privacy and security compared to direct credential sharing. It is widely used across the web and mobile ecosystem to facilitate secure interaction between services. Common applications include "Sign in with Google" or "Login with Facebook" options on various websites, where a site gains permission to access basic user profile information. OAuth also powers scenarios where productivity or photo editing apps request access to cloud storage or social media profiles to perform specific actions on behalf of the user, all without the app ever seeing the user's password. More details: https://coursesonline.com.ua/