> For the complete documentation index, see [llms.txt](https://docs.nuvolos.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nuvolos.com/concepts.md).

# Concepts

- [Hierarchy and resource model](https://docs.nuvolos.com/concepts/nuvolos-basic-concepts.md)
- [Organisational hierarchy](https://docs.nuvolos.com/concepts/nuvolos-basic-concepts/organisational-hierarchy.md)
- [Nuvolos Compute Units (NCUs)](https://docs.nuvolos.com/concepts/nuvolos-basic-concepts/nuvolos-compute-units-ncus.md)
- [Credits, HPC, and GPUs](https://docs.nuvolos.com/concepts/nuvolos-basic-concepts/credits-hpc-and-gpus.md)
- [Resting Spaces](https://docs.nuvolos.com/concepts/nuvolos-basic-concepts/resting-spaces.md)
- [Background tasks](https://docs.nuvolos.com/concepts/nuvolos-basic-concepts/background-tasks.md)
- [How applications work](https://docs.nuvolos.com/concepts/applications.md)
- [Snapshots, distribution, and states](https://docs.nuvolos.com/concepts/distribution.md)
- [Data storage](https://docs.nuvolos.com/concepts/data-integration.md)
- [Roles, secrets, and identity](https://docs.nuvolos.com/concepts/roles-secrets-and-identity.md)
- [How roles are organised](https://docs.nuvolos.com/concepts/roles-secrets-and-identity/roles.md)
- [Secrets and the override policy](https://docs.nuvolos.com/concepts/roles-secrets-and-identity/secrets-and-the-override-policy.md)
- [Identity providers](https://docs.nuvolos.com/concepts/roles-secrets-and-identity/identity-providers.md)