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What Is a Private Cloud? How It Differs from Public Cloud

A private cloud is infrastructure dedicated to one organization. How it differs from public cloud, who it suits, and the rules that apply in Türkiye.

Oğuzhan Gerçek··6 min read
What Is a Private Cloud? How It Differs from Public Cloud

Short answer: A private cloud is a cloud model in which the infrastructure is dedicated to a single organization. It can run in the organization's own data center or in a provider's facility; what defines it is not location but the fact that the resources are not shared with any other customer. In a public cloud, the same physical infrastructure is shared among many customers and the service is open to anyone. A private cloud gives you control and data residency; in exchange, you or your provider have to plan capacity and operations.

What is a private cloud?

The definitions of cloud models still in use today come from NIST's SP 800-145, published in 2011. According to NIST, a private cloud is cloud infrastructure provisioned for the exclusive use of a single organization with multiple consumers (business units, for example). It can be owned and operated by the organization, a third party or both, and it can sit on or off premises.

That definition has two practical consequences:

  • Location doesn't decide it. A cloud running in a provider's data center on hardware dedicated to you is still a private cloud.
  • Virtualization alone is not a private cloud. NIST looks for five characteristics before calling infrastructure cloud: on-demand self-service, broad network access, resource pooling, rapid elasticity and measured service. A virtualization cluster where every virtual machine takes a request form and a few days to appear lacks most of them, whatever it is called.

NIST defines two more models: the community cloud, shared by organizations with common concerns (a shared mission, security or compliance requirements), and the hybrid cloud, where at least two models are bound together.

Public cloud vs private cloud

  • Tenancy: Public cloud is multi-tenant; workloads from many customers run on the same hardware. In a private cloud the resources are dedicated to one organization.
  • Capacity: From the user's point of view, public cloud is nearly unlimited. In a private cloud, elasticity ends at the capacity you have built; growth is planned ahead.
  • Cost model: Public cloud is a pay-as-you-go expense. A private cloud either requires investment or comes with a term commitment to a provider. For steady, highly utilized workloads a private cloud is usually more economical; for variable workloads, public cloud.
  • Control and data placement: In a private cloud, which facility and which hardware your data sits on is your decision, and that is easier to demonstrate in an audit.
  • Operational load: With public cloud, the provider runs the infrastructure. With a private cloud that work sits with your own team or with a managed service provider.

What technologies is a private cloud built on?

A private cloud usually has a virtualization platform underneath and a self-service, quota and metering layer on top. Common options are VMware Cloud Foundation, OpenStack, Proxmox VE and KVM-based platforms; HCI architectures that combine storage and compute on the same nodes are also widely used.

The most talked-about change in this space in recent years happened on the licensing side. After acquiring VMware, Broadcom stopped selling perpetual licenses on December 11, 2023 and cut the product range down to subscription bundles; the date and the transition are recorded in VMware's January 2024 announcement. For some customers the impact was dramatic: in a 2024 lawsuit, AT&T claimed Broadcom's proposal would raise its annual cost by 1,050%. That is one customer's figure from a court case, but it shows the direction. We cover how to plan a move to alternative platforms in our article on VMware licensing.

Who is a private cloud for?

  • Regulated organizations: BDDK regulation allows banks in Türkiye to buy cloud services only under a private cloud or community cloud model; see our BDDK article for the details. On the public sector side, Presidential Circular 2019/12 on information and communication security requires critical data such as population, health and communication records to be stored securely within Türkiye (in Turkish), and bars public institutions from keeping their data in cloud storage services other than their own private systems or domestic providers under their control.
  • Steady, predictable workloads: Databases and business applications that run at the same level all year. Paying a premium for elasticity buys nothing here.
  • Latency-sensitive systems: Applications tightly coupled to on-premises systems, where milliseconds matter on every call.
  • Anyone with data residency concerns: Under the KVKK, personal data leaving Türkiye counts as a cross-border transfer. A private cloud built inside the country largely settles that question, as long as backups and support access stay in the country too; see our KVKK article.

Is there a move back from public cloud?

"Cloud repatriation" has been a frequent topic over the past two years, but the figures need to be read with their source in mind. In Private Cloud Outlook 2025, a survey commissioned by Broadcom, 69% of 1,800 IT leaders said they were considering moving workloads from public to private cloud, and one third said they had already done so. Note that the survey was commissioned by a company that sells private cloud software.

A more cautious reading comes from IDC: the title of its October 2025 report describes selective movement rather than a mass exodus from public cloud in Europe. What the two sources say together: organizations are not leaving the cloud wholesale; they are bringing back specific workloads whose cost or compliance does not work in public cloud.

Who will run the private cloud?

Operations are the most underestimated part of a private cloud. Every infrastructure-layer job the provider does in public cloud becomes somebody's task here: hardware failures, capacity planning, hypervisor and platform updates, infrastructure monitoring. Operating system patches and backup are yours in either model anyway. If your own team cannot staff that on-call rotation 24/7, the option is to hand the operation of the private cloud to a managed service provider; in that case, capacity expansion lead times and the limits of responsibility should be written into the contract.

Frequently asked questions

What does private cloud mean? A model in which cloud infrastructure is dedicated to a single organization. It can run in the organization's own data center or in a provider's facility.

Is private cloud the same as on-premises? No. On-premises describes a location: the system sits in the organization's own building. Private cloud describes a model: resources dedicated to one organization, with cloud characteristics such as self-service and elasticity. A private cloud can also be built off premises.

Is a private cloud more secure? Not by itself. Not sharing resources with other tenants and deciding where the data lives make audits easier, but security still depends on how patching, access management and monitoring are done.

What is a community cloud? Cloud infrastructure shared by organizations with common security or compliance requirements and closed to everyone else. Alongside private cloud, BDDK regulation recognizes this model for banks.

Is a private cloud expensive? It depends on utilization. If most of the capacity is in constant use, a private cloud is often more economical; if usage fluctuates, the cost of idle capacity comes to the fore.

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