This document discusses using Active Directory Federation Services (ADFS) with AWS Identity and Access Management (IAM) for single sign-on. It provides reasons for using ADFS like low cost, controlling AWS access through existing business processes, and audit trails. Technically, ADFS allows SAML integration with IAM and maps existing Active Directory users and groups to manage permissions without recreating accounts. The document walks through setting up a test ADFS environment, configuring an IAM identity provider, defining IAM roles, and enabling single sign-on access to AWS services using AD groups. Resources for the original configuration guide and IAM policy generation are also provided.