Directory-as-a-Service or DaaS is a virtual identity provider that securely manages and connects user identities to the IT resources they need. Those IT resources could be Windows, Mac, or Linux systems, cloud and on-prem servers (e.g. AWS, GCP, internal data centers), web and on-prem applications via SAML and LDAP, physical and virtual storage solutions, and wired and WiFi networks via RADIUS.