It is a Identity as a Service (IDaaS) that centrally manages users and groups
Federates Identities between GCP, Active Directory, Azure AD, etc.

Supports the following functionalities:

  • User Lifecycle Management
  • Device Management
  • Directory Service
  • SSO (Single Sign-On)
  • Automated Provisioning
  • Security
  • Reporting and Analytics
  • SLAs

Has two versions Free and Premium
Some of the above features are not present in the Free tier

Google Cloud Directory Sync

Enables administrators to synchronize users, groups and other data from an Active Directory/LDAP service to their Managed Service for Microsoft Active Directory within Google