Federated Identity — SSO Across Organization Boundaries
How single sign-on works across organizations, trust relationships, and identity federation patterns
You've seen authentication within a single application: user logs in, gets a token, accesses resources. But what happens when a user needs to access multiple applications across multiple organizations, all with one login? That's federated identity, and it's the backbone of enterprise SSO.
Federation is why an employee at a large company can log in once in the morning and seamlessly access their email, project management tool, cloud provider, internal wikis, and your SaaS product without typing their password again. It's also why your enterprise customers insist on SSO before they'll sign a contract.
What Federation Actually Means
Federation is a trust agreement between organizations. Company A trusts Company B to authenticate users. Instead of managing user credentials themselve
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