Single Sign-On (SSO) is a user authentication service that allows a user to use one set of login credentials (e.g., name and password) to access multiple applications. Coursera's Single Sign-On catalogue teaches you the principles, use cases, and benefits of implementing SSO. You'll learn how SSO helps in centralizing the authentication process, improving user experience, increasing security, and simplifying user management. You'll also gain knowledge on handling SSO protocols like SAML, OpenID, and OAuth. This skill is essential for security professionals, system administrators, or anyone interested in enhancing their understanding of identity and access management.