# What is Hybrid IT?

> Hybrid IT is a non-standard industry term for an information-technology estate that combines environments or delivery models under coordinated operation — for example, on-premises systems, private and public cloud services, hosted infrastructure, software as a service, edge locations, and legacy platforms.

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## Content

The term describes coexistence and integration, not one reference architecture, ownership model, migration stage, or security strategy.

Workloads, identities, data, management, and network paths may cross these environments. Effective governance therefore needs an end-to-end inventory, dependency model, responsibility map, consistent risk decisions, and controls that account for different provider interfaces and technical constraints without assuming every platform can be configured identically.

### Key points

- **Map the estate:** Record services, owners, data, identities, dependencies, providers, locations, lifecycle status, trust boundaries, and recovery requirements across every environment.
- **Unify intent, adapt implementation:** Establish common outcomes for access, configuration, logging, vulnerability treatment, change, backup, incident response, and supplier management, then implement them appropriately per platform.
- **Control connections:** Minimize and authenticate inter-environment paths, segment workloads, manage name and route changes, protect management planes, and test failure, recovery, and provider-loss scenarios.
- **Important limitation:** A unified dashboard or policy layer does not eliminate platform differences, legacy constraints, shadow services, provider dependencies, or inconsistent evidence. Centralization can also create a high-impact control-plane and availability dependency.

### Related terms

[Hybrid cloud security](<https://yellowcube.eu/glossary/hybrid-cloud-security/>) · [Multi-cloud security](<https://yellowcube.eu/glossary/multi-cloud-security/>) · [Cloud security architecture](<https://yellowcube.eu/glossary/cloud-security-architecture/>) · [SaaS security](<https://yellowcube.eu/glossary/saas-security/>) · [Network as a service (NaaS)](<https://yellowcube.eu/glossary/network-as-a-service/>) · [Data center security](<https://yellowcube.eu/glossary/data-center-security/>)

### Sources

[NIST SP 800-145, The NIST Definition of Cloud Computing](https://csrc.nist.gov/pubs/sp/800/145/final) · [NIST SP 800-207, Zero Trust Architecture](https://csrc.nist.gov/pubs/sp/800/207/final) · [NIST Cybersecurity Framework 2.0](https://www.nist.gov/cyberframework)

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