Global Information Grid (C.F.D.) definition in Computer Security terms:
Definition(s): The globally interconnected, end-to-end set of information capabilities for collecting, processing, storing, disseminating, and managing information on demand to warfighters, policy makers, and support personnel. The GIG includes owned and leased communications and computing systems and services, software (including applications), data, security services, other associated services, and National Security Systems. Non-GIG information technology (IT) includes stand-alone, self-contained, or embedded IT that is not, and will not be, connected to the enterprise network.
Source(s): CNSSI 4009-2015 (JP 1-02)
reference: CSRC Glossary