Private Cloud
A private cloud is cloud infrastructure operated for the exclusive use of a single organisation — in its own data centre or at a service provider. NIST lists it in Special Publication SP 800-145, published in 2011, as one of four deployment models alongside public, community and hybrid cloud. What defines it is not location but exclusivity of resources plus the five essential characteristics: on-demand self-service, broad network access, resource pooling, rapid elasticity and measured service.
Private Cloud in practice
The difference between a private cloud and classic virtualisation lies in the operating model, not the hardware: only when compute, storage and network are pooled, can be requested through self-service, scale elastically and are metered does the definition in NIST SP 800-145 apply. Technically a private cloud is usually built from a hyperconverged cluster with software-defined storage, a virtualisation layer, software-defined networking and an automation or portal layer on top.
Its advantage over public cloud is data sovereignty, predictable latency to local systems and the ability to meet requirements without additional third-party processing; the price is that capacity must be held in reserve and the lifecycle owned in house. A managed private cloud shifts that responsibility to a provider without giving up exclusivity. For mid-sized companies a private cloud rarely replaces Azure or Microsoft 365; it is the local half of a hybrid architecture, hosting manufacturing, engineering and ERP workloads with hard latency or licensing constraints while identity, collaboration and analytics live in the cloud.
Alendris draws that dividing line during the assessment and builds the local side so it stays consistently manageable via Azure Arc and a hybrid identity bridge to Entra ID.