What is a Public Cloud?

Gui Alvarenga - June 24, 2022

Are you ready to expand your business? If so, you may be facing the massive costs and increasing vulnerabilities that come with scaling your IT infrastructure. For some companies, these obstacles are enough to stop growth in its tracks.

The solution you’re looking for might be a public cloud. Public clouds can supply accessibility, scalability and functionality while keeping your upfront costs low.

How a Public Cloud Works

A public cloud is a third-party IT management solution that hosts computing services and physical infrastructure. There are three cloud model types: software as a service (SaaS), platform as a service (PaaS) and infrastructure as a service (IaaS). Each of these models allows organizations to access resources and technology without hosting them in a corporate-owned data center.

Essentially, public clouds offer companies a chance to virtually rent equipment, software and storage. While companies host private clouds within their own servers, anyone can purchase public cloud services and securely share their use.

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SaaS delivers applications like email and file storage through a web browser. With SaaS, there’s no need to download any software or keep up with updates. Google Workspace and Dropbox are both excellent examples of SaaS cloud services.

PaaS gives users a cloud environment to build and deploy apps and databases. You receive software and infrastructure available through the web. Because it provides middleware, development tools and database management, it can support the entire application building process from design to launch and maintenance.

IaaS offers users a full range of infrastructure from servers to operating systems and public cloud storage solutions. Organizations access a vast network of hardware through a dashboard and gain full control over the infrastructure — all without the expense of physically maintaining it.


SaaS is useful because it eliminates in-house software and hardware management. Businesses use them for tasks such as:

  • Project management and collaboration
  • Improving customer support
  • File management
  • Social media management
  • Employee time tracking
  • Collecting and analyzing data

Organizations use PaaS primarily for developing apps. PaaS cuts down on coding time and allows efficient collaboration as well.

IaaS use cases include these:

  • Data storage, including backups and recovery
  • Cloud computing
  • Networking resources
  • Big data analysis

Reasons to Use a Public Cloud

Cloud adoption is on the rise — in fact, according to the Flexera 2021 State of the Cloud Report, 91% of businesses use public clouds. This high adoption rate springs from the benefits of using a public cloud — most notably, they are cost-effective and convenient.

Upfront Costs

Creating an IT infrastructure requires a big investment. You need to purchase hardware, software and a location for your servers and equipment. As a public cloud user, you avoid upfront costs. Plus, you only pay for the services your company uses each month.

In addition, you save money on maintenance, and you avoid costs of replacing and upgrading outdated equipment every few years. All those costs are covered by your cloud provider.


Public clouds are a uniquely scalable infrastructure option. If you choose to purchase your own in-house IT infrastructure, the setup process could take months. Then, when it’s time to grow, you’ll have to buy, set up and maintain more equipment. On the other hand, if your usage drops, you’ll be stuck with underutilized equipment that drains your resources only to collect dust.

Public clouds can keep up with your business needs, whether that means expanding or scaling back. They already have the physical infrastructure in place; all you have to do is purchase access to it. You can scale networking, processing power and data storage capacity all without disrupting your business.


Cloud services allow you to access your data, platforms and software from anywhere there’s internet access. Instead of being tied to a desktop or server, you have the freedom to work anywhere you need to by using a public cloud.

They also make it easier to collaborate on tasks and projects. An entire team will have access to the same tools, resources and data — all updated in real time.


Public clouds can be more reliable than in-house infrastructure. Public cloud service providers generally maintain a network of servers, so total failure is rare. If one server fails, another in the network will pick up the slack immediately. For a business owner, that means an error won’t interrupt your access, which leads to a more efficient workday.

Plus, public clouds automatically back up any stored data. Whether your business undergoes a technological failure or a cloud security threat, you can easily restore lost data.

Types of Public Cloud

The tools and services that public cloud platforms provide vary by the individual cloud provider. Some of the top providers include Microsoft, Google and Amazon.

Finding Public Cloud Providers

Microsoft Azure provides a full range of public cloud services from your choice of cloud model. The PaaS, SaaS and IaaS offerings allow businesses to carry out cloud computing and data analysis in addition to providing cloud storage as well as other Microsoft tools.

The Google Cloud platform supports IaaS and PaaS services, while Google Workspace covers SaaS services. Google Cloud’s range of options allows businesses to store data, network, develop apps and complete other computing tasks.

Amazon Web Services offers users a strong cloud infrastructure for IaaS and PaaS services. In addition to the standard data storage and networking services, it can provide the resources to perform cloud computing and machine learning. It also offers mobile services and cloud security solutions.

Choosing the Best Provider

Choosing the best provider is an essential step for cloud migration; you may be locked into a long-term contract. As you consider your options, look for these qualities:

  • The range of services your business and workload require
  • Integration with existing technology
  • Excellent past performance record
  • Adequate security regulations
  • Reasonable pricing

In addition, it is recommended that you find out where the cloud service provider and its servers are located. As your distance to the server affects speed, you may experience latency if your data is in another hemisphere. Moreover, many privacy laws restrict where certain types of data may be stored. Make sure your provider complies with local laws.

Using a Hybrid Cloud

In some cases, a public cloud may not be able to meet all your business needs. For instance, many companies prefer not to use a public cloud to store sensitive data due to security concerns. You may find the best cloud solution is a hybrid cloud.

A hybrid cloud combines a private cloud and a public cloud into one computing environment that shares data. Most public cloud providers, such as Microsoft Azure and the Google Cloud platform, support hybrid cloud integration.

While startups and small businesses can often rely entirely on public clouds, older and larger businesses likely have already invested time and money into infrastructure. Still, they could benefit from the extra flexibility and performance that a public cloud offers. By implementing a hybrid cloud, companies can expand without sacrificing previous investments.

Regulations in certain industries — such as healthcare, finance and government — require that companies store some data in house. Affected businesses may benefit the most from a hybrid cloud solution. It allows them to take advantage of the scalability and accessibility of a public cloud while staying within legal data storage requirements.

Business Risks of Using a Public Cloud

No technology is without risks, and public clouds are no different. They particularly present challenges to security, control and budget — but careful planning and management can reduce these risks.


Unlike a private cloud, public clouds are shared environments, which presents unique security risks. For example, though public cloud providers invest plenty of resources into cybersecurity, they are especially vulnerable to data breaches. In addition, their convenient accessibility can be a risk as well — identity fraud and phishing attacks can leave them wide open to cybercriminals.

One way to overcome public cloud security concerns is to invest in workload protection. Cloud workload protection provides breach protection on any cloud without sacrificing performance. You can also protect your data by using encryption, multifactor authentication and VPNs.


By using a public cloud, you might sacrifice some control over your business tasks. For instance, SaaS products are often “one size fits all.” You may not be able to customize the software to your needs. As a result, you may have to change your business model to fit the software’s functionality.

In addition, public cloud companies can make changes to their hardware and software without consulting cloud users. You may lose crucial features in an update, or suddenly encounter a new vulnerability after a policy or procedure change.

The best way to deal with limited control is to maintain a hybrid cloud. However, you can also negotiate the contract with your cloud provider for more control.


Public clouds allow businesses to avoid the cost of IT infrastructure as well as maintenance fees, but you may spend more for cloud access over time. When you take advantage of a public cloud environment, you essentially become a tenant of another company’s servers. Renting instead of owning adds another monthly bill to your expenditures and leaves you vulnerable to rising prices, especially paired with the standard pay-per-use model.

However, you can navigate the financial risk with a combination of budgeting and tracking. When you keep track of your usage, you won’t be blindsided by unexpected fees.

Learn More about Public Cloud Solutions Today

A public cloud is one way that a business can expand and modernize without spending thousands of dollars on IT infrastructure. Though there are some security and financial risks associated with public clouds, they vastly improve scalability and accessibility. The right public cloud provider can offer your business the resources you need to succeed.

Moving your IT infrastructure to a public cloud may require an upgrade in your security.

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Guilherme (Gui) Alvarenga, is a Sr. Product Marketing Manager for the Cloud Security portfolio at CrowdStrike. He has over 15 years experience driving Cloud, SaaS, Network and ML solutions for companies such as Check Point, NEC and Cisco Systems. He graduated in Advertising and Marketing at the Universidade Paulista in Brazil, and pursued his MBA at San Jose State University. He studied Applied Computing at Stanford University, and specialized in Cloud Security and Threat Hunting.