SSO

Single sign-on (SSO) is the authentication pattern where users authenticate once with an identity provider — Microsoft Entra ID — and access many connected applications without re-entering credentials. In Microsoft 365, SSO is built in across Microsoft apps; for third-party SaaS, SSO is configured per app using SAML 2.0 or OpenID Connect (OIDC) with Entra ID as the IdP. From the user's experience: sign in once in the morning, every connected app works automatically. From IT's: one place to enforce MFA, Conditional Access, and access governance. SSO is the foundation of identity-led enterprise architecture and a prerequisite for zero-trust controls.