What is ADFS and how was it used?

ADFS (Active Directory Federation Services) is a Microsoft solution for single sign-on (SSO) and federated authentication between different systems and organizations.

Key points of working with ADFS:

• Allows users to use their Active Directory credentials to access external applications and services without re-entering passwords.
• Operates based on federated authentication protocols such as SAML, OAuth, OpenID Connect.
• Includes configuration of trust relationships between organizations or services.
• Administration typically involves setting token issuance rules, managing certificates, and monitoring.

In practice, I have configured ADFS to integrate a corporate portal with external SaaS applications, providing secure and convenient access for employees without the need to create separate accounts in each service.