System for Cross-domain Identity Management (SCIM) is a protocol that automates the process of adding users to various applications within an organization. This tutorial provides a comprehensive guide on how SCIM works, using real-world examples and API calls and responses. The full SCIM lifecycle includes authentication, provisioning, modifying, synchronization, deprovisioning, handling errors, rate limits, and service provider configurations. Implementing SCIM in an application requires building complex provisioning logic, user synchronization, and enterprise-grade security features. WorkOS offers a ready-to-use SCIM implementation that can be integrated into applications to make them Enterprise Ready quickly.