Modeling a multi-tenant app is crucial for B2B SaaS businesses, as it enables efficient management of user authentication and authorization architecture. WorkOS offers organizations as a top-level resource to support complex models, onboard users and orgs frictionlessly, and respond to user changes from the customer's identity provider (IdP) in real time. Organizations can be used for grouping users under specific authentication policies, containing enterprise features like user provisioning and audit logs, or as a workspace for collaboration. WorkOS provides APIs and tools to manage org memberships, enabling automatic assignment of roles to users and automating the provisioning and deprovisioning of users.