SCIM (System for Cross-domain Identity Management) is an open standard for automating the exchange of user identity information between identity providers (Okta, Azure AD, Google Workspace) and service providers (SaaS apps).
With SCIM enabled, the IdP becomes the source of truth for user accounts. When a user is created in the IdP, SCIM provisions a corresponding account in the SaaS app. When the user is moved to a different group, SCIM updates their role. When the user is offboarded from the IdP, SCIM deactivates their SaaS account — closing a critical security gap.
SCIM is typically paired with SAML SSO; SSO handles authentication (sign-in), SCIM handles user lifecycle (create, update, delete).