C4 Context and Component diagram modeling an External Service integrating a New Service UI through embedded components and SSO authentication. End Users access the Admin UI, which delegates authentication to an Identity Provider via SSO, then routes to a Single Page Application frontend that communicates with a Backend API and Persistent Storage. The New Service UI is embedded within the External Service UI boundary, demonstrating a federated architecture pattern with clear separation of concerns and synchronous/asynchronous integration points. This diagram illustrates best practices for multi-service systems requiring unified authentication and seamless UI composition. Fork and customize this template on Diagrams.so to model your own service boundaries, authentication flows, and component interactions.