SCIM
SCIM stands for "system for cross-domain identity management."
In short, SCIM is a strategy to move users throughout the code in a way that is fast, cheap, and dependable. SCIM is a strategy rather than a product.
SCIM is a set of ideas that describe how users can be managed in the cloud so that they are understandable for all developers that are working within the system.
For more information, see System for Cross-domain Identity Management.