The stats for public clouds depict a healthy state of affairs. According to Statista, revenue in the public cloud market is projected to reach $525.6 billion in 2023. Furthermore, the market’s largest segment is software as a service, which has a projected market volume of $253.9 billion this year.
SEE: Forrester predicts the public cloud market to reach $1 trillion by 2026.
With this in mind, it’s worth understanding what the public cloud is and how it works as well as considering its key benefits, drawbacks and features.
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A public cloud is a type of cloud computing where a third-party service provider offers computing resources, including software applications, virtual machines and complete infrastructures, over the public internet. These resources are shared among multiple users but are kept secure and segregated to ensure privacy and security.
There are three types of public clouds:
Among popular public cloud service providers are Amazon Web Services, IBM, Google, Microsoft, Oracle and Salesforce.
Public cloud operates on a shared infrastructure model, where multiple users access the same physical resources such as servers, storage and network devices. These resources are owned and managed by a third-party cloud service provider and are divided into multiple virtual instances through virtualization. Each user accesses their own virtual environment, which appears as a separate, private network, despite the shared underlying hardware.
SEE: Take advantage of TechRepublic Premium’s cloud engineer hiring kit to find the right fit for your team.
The allocation of resources in the public cloud is managed by the cloud service provider’s management software, often referred to as the cloud orchestration platform. This platform enables the automatic allocation of virtual resources based on user requests, ranging from a single virtual machine to a complex multi-tier application environment. The public cloud also employs automation for resource provisioning, scaling and management, allowing users to quickly adjust resources based on their needs.
Public clouds use distributed storage systems for data management, spreading data across multiple physical disks in different locations for high availability, redundancy and fast data access. Security measures, including encryption, identity and access management, and physical security controls, are implemented to protect the shared infrastructure and users’ data. Thus, the public cloud leverages virtualization, automation and distributed storage technologies to provide scalable, on-demand computing resources over the internet.
Third-party cloud service providers manage public clouds, so IT departments don’t have to worry about managing applications infrastructure or networks at all. This allows IT staff to focus on other work.
In some cases, especially for smaller companies, on-staff expertise may be lacking for IT platforms and services. Public cloud services providers typically have on-staff expertise that can handle computing tasks and fill in any IT skills gaps.
Since a public cloud services provider supplies computing resources for many different companies, the costs of the cloud are shared. This can lower overall enterprise IT costs, especially for businesses with fluctuating needs.
Public cloud infrastructures are flexible. If more computing power or storage is needed, businesses can scale their needs upwards on the spot. Conversely, businesses can also downscale resources when they’re no longer needed.
Compared to an amortized capital investment in software or hardware for data centers, where businesses continue to pay even when resources are dormant, public clouds tend to be more flexible and affordable.
One of the main drawbacks of public clouds is sharing computing resources with others. Even though public cloud providers ensure client computing is kept secure and segregated, being in a shared environment may not be secure enough for some clients, especially those dealing with sensitive data.
SEE: Consider using a private cloud.
For clients that require exceptional transaction processing speeds, the public cloud may not be the best choice. Since public clouds are commonly accessed over the public internet, data transmission rates may be slower compared to private networks. This could impact real-time or latency-sensitive applications.
In a public cloud, the cloud service provider controls and manages the underlying infrastructure. As a result, customers have limited control over the hardware and software and may not be able to customize the environment to the same extent as they could with a private cloud or on-premises infrastructure.
For organizations operating in heavily regulated industries such as healthcare or finance, compliance can be a challenge. Data residency and privacy laws may restrict where data can be stored and processed, which can be difficult to manage in a public cloud environment.
The cost of public cloud services can vary widely depending on the specific services used, the amount of resources consumed and the pricing model of the cloud provider. It’s challenging to provide an average cost due to these variables, so pay-as-you-go models are more common.
These models ensure businesses only pay for the resources they use, so public cloud can be more cost-effective. However, costs can quickly add up with heavy usage.
SEE: Consider a hybrid cloud approach.
In the public cloud, the cloud provider and the customer share responsibility for security. The cloud provider secures the underlying infrastructure, including the physical data centers, servers and networking hardware. They typically offer a range of security features, including encryption, firewalls and access controls.
However, customers are responsible for securing their data and applications within the cloud, including managing user access, protecting data privacy and complying with relevant regulations.
Some of the top public cloud providers include Amazon Web Services, Microsoft Azure and Google Cloud.
AWS is one of the leading public cloud providers. They offer an array of global cloud-based services spanning compute, analytics, networking, management tools, IoT, mobile, storage, databases, developer tools, security and enterprise applications. AWS is known for its scalability, security and extensive suite of cloud services.
Microsoft Azure is another major player in the public cloud market. Azure provides a huge variety of cloud services covering computing, storage, networking and analytics. Azure is well-integrated with other Microsoft products, making it a popular choice for organizations that use a lot of Microsoft software.
GCP offers cloud computing services that run on the same infrastructure that Google uses internally for its consumer-facing products such as YouTube and Google Search. GCP provides services such as computing, data storage, data analytics and machine learning. It’s popular for its strong capabilities in data analytics, AI, ML and its competitive pricing.
Organizations considering public cloud services should initiate their decision-making process by evaluating their specific IT requirements and budget. They should consider factors such as the size of the organization and the intended use of the cloud. For instance, a smaller company might be interested in completely transferring its IT operations to the cloud, while another might only want to use the public cloud for application testing before hosting them in-house.
Certain organizations might be seeking a public cloud provider that offers specialized software and expertise in a specific domain, such as sales or finance. The needs are diverse and vary from one organization to another and for some, public cloud services might not be a suitable option. However, for many others, public cloud providers present flexible IT deployment and cost alternatives that can prevent significant internal data center expenditures.
If you’re still unsure if a public cloud infrastructure suits your business’s needs, see how it compares to hybrid and private cloud options, or consider adopting a multicloud approach.
