The System for Cross-Domain Identity Management (SCIM) is an open standard designed to streamline user identity management across multiple domains by automating the synchronization of user identities between Identity Providers (IdP) and cloud-based Service Providers (SP) using standard JSON and REST-based specifications. This automation reduces errors and saves time by keeping authentication data up-to-date, deactivating accounts when users leave or roles change, and allowing access to multiple applications with a single login through integration with Single Sign-On (SSO). SCIM's standardized APIs eliminate the need for custom coding, simplifying identity management for large organizations. In contrast to SAML, which focuses on exchanging authentication and authorization data, SCIM primarily handles user provisioning and de-provisioning, enhancing security and user experience by reducing the need for password sharing and allowing for fine-grained access control. SCIM is crucial for modern identity management systems, and platforms like Descope offer solutions to integrate SCIM seamlessly, providing enterprises with tools like single sign-on and fine-grained authorization to ensure consistent authentication information across applications.