“Store in the cloud,” “move to the cloud,” “cloud solution” — these phrases are everywhere, but what exactly lies behind the “cloud” metaphor? There’s no fog or ethereal servers; this term represents a very concrete technological model that has transformed the entire information technology industry over the past fifteen years.

Let’s break down what cloud technologies are, how they work, and why virtually the entire modern internet — from your streaming service to corporate systems — operates on the “cloud” in one way or another.

What the “Cloud” Really Is (No Metaphors)

The cloud is simply other people’s computers that you access over the internet. Seriously, that’s the most accurate definition.

When Amazon provides cloud computing resources, it is literally renting out the computing power of its massive data centers located worldwide. You gain access to processors, memory, storage, and network resources — but physically, they reside in an Amazon data center somewhere in Frankfurt, Virginia, or Singapore.

The alternative is to own your physical servers in your own server room. This is called on-premises (local infrastructure). Both approaches have their advantages and disadvantages.

Three Cloud Service Models: IaaS, PaaS, and SaaS

Cloud services exist at different levels of abstraction, denoted by a set of acronyms that often cause confusion.

IaaS — Infrastructure as a Service

You rent virtual servers, storage, and networking — bare metal in the cloud. You install the operating system yourself, configure all necessary software, and manage the setup. Maximum flexibility, maximum responsibility.

Example: Amazon EC2, where you get a virtual server with the desired number of processors and memory and can do anything you want with it.

PaaS — Platform as a Service

The cloud provider manages the infrastructure and operating system, providing a ready-to-use platform for developing and running applications. You focus on your application code without worrying about servers.

Example: Google App Engine, Heroku — you upload your application code, and the platform handles its operation, scaling, and availability.

SaaS — Software as a Service

A ready-made application accessible via a browser or mobile app. The provider manages everything — infrastructure, platform, and the application itself. The user simply uses the service.

Examples: Google Docs, Microsoft 365, Salesforce, any service you use via a browser without installing it on your computer.

Three Types of Cloud Deployments

Public Cloud — Resources from AWS, Microsoft Azure, Google Cloud, or other providers, shared among multiple clients. Benefits from economies of scale, no need to worry about infrastructure, but data is stored on third-party servers.

Private Cloud — Cloud infrastructure owned and managed by a single organization, often in its own data center. Maximum control and security, but significantly more expensive than a public cloud.

Hybrid Cloud — A combination of public and private. Sensitive data and critical systems are kept in a private cloud or on-premises, while less critical workloads run in the public cloud. The most common approach for large organizations.

Why All Businesses Moved to the Cloud

Before the cloud era, a company needing a new server had to: order equipment, wait several weeks for delivery, physically install it in the server room, configure it, and only then use it. Moreover, the server had to be purchased with excess capacity for future growth, and most of the time, it would operate below full load.

The cloud fundamentally changed this model.

Elasticity and Scalability. Need more capacity for a promotional campaign or seasonal peak? Add resources in minutes via a web console. Once the peak passes, reduce them and stop paying for what you don’t need.

Pay-as-you-go Model. You only pay for what you actually use — compute hours, gigabytes of storage, data transfer volume. Capital expenditures on equipment purchase transform into predictable operational expenses.

Global Deployment. Major cloud providers have data centers located worldwide. Deploying a copy of your service closer to users in another region can be done in minutes, without a physical presence in that country.

Reduced Operational Burden. Disk replacement, physical cooling, network equipment upgrades, physical-level backups — these are the provider’s problems, not your IT team’s.

Built-in Security and Compliance. Large providers invest in security certifications that would be unattainable and prohibitively expensive for most companies to achieve independently.

Who Are the Main Players in the Cloud Market?

Amazon Web Services (AWS) — The market leader, launched in 2006, first to commercialize the public cloud concept. Offers hundreds of services from virtual machines to specialized databases and machine learning tools.

Microsoft Azure — Second largest, strong position in the enterprise segment due to integration with Microsoft products (Windows, Office 365, Active Directory).

Google Cloud Platform (GCP) — Third largest, strong position in data, machine learning, and containerization.

Yandex Cloud and SberCloud — Russian alternatives, particularly relevant for companies working with personal data of Russian citizens under the requirements of 152-FZ.

Risks of Cloud Technologies

Vendor Lock-in. Migrating from one cloud provider to another is a technically complex and costly process due to the incompatibility of proprietary services.

Data Sovereignty Issues. Data stored in foreign data centers falls under the legislation of the country where it is located, creating legal complexities for regulated industries.

Internet Connection Dependency. Cloud services are inaccessible without an internet connection — this is unacceptable for some critical systems.

Configuration Security Risks. Most data breaches in the cloud occur not due to provider hacks, but due to incorrect client configuration — open storage, excessive access rights, unsecured APIs.

Conclusion

Cloud technologies are not a marketing abstraction but a concrete infrastructural model that has fundamentally changed the cost-flexibility ratio of IT resources. Most services you use daily — from email to streaming — operate in the cloud. Understanding the basic principles of this model helps you more consciously evaluate technological solutions and discuss IT without feeling like it’s something mystical.