Further reading

• What is Azure Active Directory? (https://docs.microsoft.com/en-us/azure/active-directory/fundamentals/active-directory-whatis)
• What is guest user access in Azure Active Directory B2B? (https://docs.microsoft.com/en-us/azure/active-directory/b2b/what-is-b2b)
• What is Azure Active Directory B2C? (https://docs.microsoft.com/en-us/azure/active-directory-b2c/active-directory-b2c-overview)
• What is hybrid identity? (https://docs.microsoft.com/en-us/azure/active-directory/hybrid/whatis-hybrid-identity?context=azure%2Factive-directory%2Fusers-groups-roles%2Fcontext%2Fugr-context)
• Add branding to your organization's Azure Active Directory sign-in page (https://docs.microsoft.com/en-us/azure/active-directory/fundamentals/customize-branding?context=azure/active-directory/users-groups-roles/context/ugr-context)