SCIM (System for Cross-Domain Identity Management) is a protocol that streamlines enterprise user management by enabling automatic provisioning and access management, improving security posture, and simplifying billing processes. It works as a single source of truth for employee identity information within an organization's IdP (Identity Provider). By implementing SCIM, businesses can eliminate manual work in account creation, deprovisioning, and access management, reducing security vulnerabilities and ensuring accurate billing. Additionally, SCIM allows the syncing of additional user attributes to enhance the overall user experience and functionality within applications.