# Concept

- [Organization Structure](/concept/organization-structure.md)
- [C4AI Command](/concept/c4ai-command.md)
- [SIC (Service Identity Code)](/concept/sic-service-identity-code.md): Unified C4AI service/entity identifier
- [.cc4](/concept/.cc4.md): Unified file extension for data transfer across environments
- [Glossary](/concept/glossary.md): Terminology