OAuth 2.0 is an authorization protocol that simplifies access to data on web servers, allowing client applications to access resources more securely by separating roles and responsibilities between entities involved in the authorization flow. It reduces the risk of password theft and unauthorized access by not requiring users to share their credentials, providing greater access control and enhancing privacy and data protection. OAuth 2.0 has multiple grant types, including Authorization Code Grant, Implicit Grant, Client Credentials Grant, and Password Grant, each designed for specific scenarios. CData supports OAuth with various features such as retrieving OAuth tokens, facilitating the OAuth flow in desktop and web applications, and providing headless OAuth processes for OEM customers. The protocol provides enhanced security, allows users to grant limited access to protected resources without sharing usernames and passwords, and requires client registration for applications seeking access to protected resources. Understanding technical terms is crucial for navigating the OAuth authentication process effectively.