Quick answer: Cloud systems are deployed in three main ways. A public cloud shares hardware and networks with other users. A private cloud dedicates isolated resources to one organization. A hybrid cloud combines both, keeping sensitive workloads private and running the rest on public infrastructure. Public cloud is the cheapest and easiest to scale, private cloud gives the most security and control, and hybrid cloud balances cost, flexibility and compliance.
Understanding these cloud deployment models is the first step in choosing the right infrastructure. Whether you use IaaS, PaaS or SaaS, each comes in public, private or hybrid form.
Public vs Private vs Hybrid Cloud at a Glance
| Public Cloud | Private Cloud | Hybrid Cloud | |
|---|---|---|---|
| Resources | Shared with other users | Isolated for one organization | Mix of private and public |
| Cost | Lowest | Highest | Moderate (higher setup cost than public) |
| Security | Good, but shared infrastructure | Highest | High for sensitive data kept private |
| Scalability | Near-unlimited, on demand | Limited by your hardware | Flexible through cloud bursting |
| Control | Limited to provider’s options | Full customization | Control where you need it |
| Compliance | Can be harder | Easier | Easier for regulated data |
| Best for | Startups, variable workloads | Regulated or sensitive workloads | Growing businesses with mixed needs |
What Is a Public Cloud?
A public cloud is the most common way to deploy cloud computing. Your organization shares hardware, networks and storage with other customers, with no physical separation. Gmail and Google Drive are everyday examples, and Microsoft Azure is a well-known enterprise one.
Why businesses choose it: It has the lowest upfront cost, because there are no servers to buy or configure. The provider handles maintenance and updates. Pay-as-you-go pricing means you pay only for what you use, and you can scale up almost without limit. Providers also build in redundancy, so a hardware failure doesn’t take you offline.
The trade-offs: Shared infrastructure raises security and privacy concerns, especially for sensitive data such as card transactions or customer profiles. You are also limited to the configurations your provider offers, which can make regulatory compliance harder.
Public cloud advantages and disadvantages
- ✅ Low cost
- ✅ Easy to scale
- ✅ No infrastructure maintenance
- ✅ Built-in redundancy
- ❌ Security and privacy risks
- ❌ Compliance challenges with third-party infrastructure
What Is a Private Cloud?
In a private cloud, computing resources are physically isolated and dedicated to a single organization, delivered over a secure private network. A private cloud is not always on-premise. There are two types:
- On-premise private cloud: Your company runs its own data centre, and your IT team handles security, maintenance and updates. It takes longer to build and is harder to scale.
- Hosted private cloud: A third-party vendor maintains the data centre. The hardware may sit alongside other customers’ equipment, but your resources are never shared and you connect over a separate private network.
Either way, you get more control, higher security and easier regulatory compliance. The cost is scalability and budget. Private clouds are more expensive to set up and run, and sudden or seasonal demand spikes are harder to absorb. IBM, Oracle and VMware are well-known private cloud providers.
Private cloud advantages and disadvantages
- ✅ Higher security
- ✅ Easier regulatory compliance
- ✅ More control and customization
- ❌ More expensive
- ❌ More maintenance than public cloud
What Is a Hybrid Cloud?
A hybrid cloud combines private and public clouds. Sensitive workloads, such as financial data, stay on the private side, and everything else runs on the public cloud. This keeps costs down without compromising security or compliance.
Hybrid cloud also enables cloud bursting. You run your usual demand on a private cloud, and when traffic spikes, the extra load spills over to the public cloud. A private cloud sized for peak demand sits idle most of the time, while relying only on public cloud can become expensive for high-demand applications over the long run. NetApp is a leading hybrid cloud provider, with partnerships across Microsoft Azure, Google Cloud and Amazon Web Services.
Hybrid cloud advantages and disadvantages
- ✅ Cost-effective
- ✅ Flexible and scalable
- ✅ Private control for sensitive data
- ❌ Higher initial cost than public cloud
Hybrid Cloud vs Private Cloud: Which Should You Choose?
There’s no universally right answer, only what fits your business. Weigh these four factors:
- Type of workload: Is your data sensitive or regulated?
- Security needs: How much isolation and control do you require?
- Ease of management: Do you have an IT team to run infrastructure?
- Cost: What is your upfront budget versus long-term spend?
Rule of thumb: Starting out or running variable workloads? Choose public. Handling regulated or highly sensitive data? Choose private. Need both cost efficiency and control, or face seasonal spikes? Choose hybrid.
Frequently Asked Questions
What is the main difference between public, private and hybrid cloud?
Public cloud shares infrastructure among many users, private cloud dedicates infrastructure to one organization, and hybrid cloud combines the two so workloads can run where they fit best.
Which cloud model is the cheapest?
Public cloud, thanks to low upfront costs, no infrastructure maintenance and pay-as-you-go pricing.
Which cloud model is the most secure?
Private cloud offers the highest level of security and control because its resources are isolated and not shared.
Is hybrid cloud better than private cloud?
Not always. Hybrid cloud is more flexible and cost-effective for variable demand, while private cloud suits organizations that need full isolation for all workloads.
What is cloud bursting?
Cloud bursting is a hybrid cloud technique in which a private cloud handles normal demand and overflow traffic is sent to the public cloud during spikes.
Can IaaS, PaaS and SaaS run on any cloud model?
Yes. Each service model can be delivered through public, private or hybrid deployment.
Build on the Right Cloud Foundation
Choosing a cloud model is just the starting point. Connected products, from sensors to dashboards, need the right architecture behind them. If you’re planning a connected product, our team offers end to end IoT services, from architecture and cloud deployment to development and scaling. Talk to us about your product idea.