In the realm of Single Sign-On (SSO), two terms frequently arise, often causing confusion: Central Authentication Service (CAS) and Identity Providers (IdP). Both are integral to SSO implementation, but they serve distinct roles. Understanding these distinctions is crucial for businesses seeking to deploy SSO effectively. This comprehensive guide aims to unravel the complexities surrounding CAS and IdPs. We’ll delve into their individual functions, how they interact within an SSO architecture, and how a solution like SSOJet can simplify this process, ensuring a seamless and secure authentication experience for your users.