Glossary
SSO (Single Sign-On)
Authentication scheme that lets users sign in once with one identity provider and access many applications.
Definition
Single Sign-On lets a user authenticate with an identity provider (IdP) — Okta, Azure AD/Entra ID, Google Workspace, custom IdP — and then access multiple downstream applications without re-entering credentials. The technical protocols underneath are typically SAML 2.0 (enterprise) and OIDC (modern, OAuth 2.0-based). SCIM is the companion protocol used to provision and de-provision users from the IdP into the application.
Why it matters
Enterprise customers will demand SSO and SCIM before they sign. Retrofitting them is painful. Designing your auth layer with pluggable identity from the start avoids the panic at the first enterprise deal.
See also
RBAC (Role-Based Access Control)
Access-control model where permissions are granted to roles, and users inherit permissions by being assigned to roles.
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Software delivered over the internet on a subscription, typically multi-tenant and accessed via a browser or app.
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