Single Sign-On (SSO) is a method of authentication that allows a user to access multiple applications or systems with a single set of login credentials. Instead of requiring a separate username and password for each application, SSO allows the user to enter their login information once and then access multiple applications without needing to enter their login information again.

The main goal of SSO is to simplify the user experience by eliminating the need to remember multiple usernames and passwords, and also to improve security by reducing the number of places where sensitive information is stored.

SSO can be implemented in a variety of ways, depending on the specific requirements of the organization and the applications that need to be accessed. Some common SSO implementation methods include:

• Active Directory Federation Services (ADFS): This is a Microsoft technology that allows organizations to use Active Directory (AD) as the central repository for user authentication.
• SAML (Security Assertion Markup Language): This is an open standard that allows different systems to share authentication information.
• OAuth and OpenID Connect: This is an open standard for authorization that allows third-party applications to access a user’s information without requiring their password.

SSO can be used in a variety of settings, including enterprise environments, cloud-based applications, and consumer-facing websites. It is often used in conjunction with other security measures such as multi-factor authentication (MFA) to provide an added layer of security.