What is the cloud and how does it work?

A cloud uses physical servers in data centers to provide storage space, computing power, and software over the internet. Busi­ness­es and private users can access these resources in­de­pen­dent­ly of location and in encrypted form, adjusting them flexibly to their needs. Cloud computing therefore replaces fixed, on-premises IT systems with a flexible, scalable, and more efficient al­ter­na­tive.

Out­sourc­ing storage and ap­pli­ca­tions to the cloud—a term derived from the symbolic depiction of invisible IT in­fra­struc­ture as a “cloud”—offers a high degree of flex­i­bil­i­ty. Resources can be scaled up or down as needed, providing the foun­da­tion for modern scal­a­bil­i­ty.

Cloud computing has been around for decades, but it only gained real momentum with the rise of the internet. Today, pro­fes­sion­al cloud providers follow com­pre­hen­sive security standards, implement zero-trust ar­chi­tec­tures, and operate data centers that comply with U.S. reg­u­la­tions such as HIPAA, CCPA, and SOC 2—sig­nif­i­cant­ly reducing earlier concerns about data privacy and security.

What can you use the cloud for?

Cloud services shift data, ap­pli­ca­tions, and computing tasks to external servers instead of keeping them on local machines. This allows users to rent storage and pro­cess­ing power on demand—without pur­chas­ing or main­tain­ing their own hardware. Many programs run directly in a web browser or app, elim­i­nat­ing the need for local in­stal­la­tion.

Key use cases at a glance:

• Store, back up, and sync files across multiple devices
• Access software directly in the browser (SaaS) without in­stalling it locally
• Scale computing power as needed (e.g., for analytics, de­vel­op­ment, or AI workloads)
• Col­lab­o­rate with teams using cloud-based tools
• Automate backup creation and recovery
• Host websites, online stores, and web ap­pli­ca­tions
• Run virtual servers, databases, or complete IT in­fra­struc­tures

Cloud computing plays a central role in real-time col­lab­o­ra­tion. Many modern col­lab­o­ra­tion tools are cloud-based, enabling teams to work together re­gard­less of location. Cloud platforms also provide the foun­da­tion for hosting websites, e-commerce stores, and ap­pli­ca­tions, as well as operating virtual machines, databases, and de­vel­op­ment en­vi­ron­ments.

Another core function of the cloud is reliable data backup. Backups can be created and restored au­to­mat­i­cal­ly, reducing manual effort and min­i­miz­ing risk. Pro­fes­sion­al data centers rely on redundant storage systems and extensive technical and physical security measures to ensure high avail­abil­i­ty and round-the-clock access to data.

How does a cloud work?

At its core, the cloud functions similarly to a corporate network. Users log in with their cre­den­tials to access data and ap­pli­ca­tions. The key dif­fer­ence is that cloud servers are not located on-site but hosted in pro­fes­sion­al­ly managed data centers. In these data centers, storage capacity, computing power, and memory are delivered in vir­tu­al­ized form and managed through automated control and security systems. Users connect via web in­ter­faces, browsers, or dedicated ap­pli­ca­tions—allowing them to manage files much like they would on a local hard drive and run software directly online.

What are the different types of clouds?

To select the model that best aligns with their IT in­fra­struc­ture, companies need to un­der­stand the main types of cloud de­ploy­ments. These models differ primarily in who manages the resources, how access is granted, and the level of flex­i­bil­i­ty and control they offer—ranging from tightly con­trolled internal en­vi­ron­ments to highly scalable, ex­ter­nal­ly operated services.

Private cloud

When companies operate their own servers or dedicate exclusive resources to their employees, this is known as a private cloud. Data and ap­pli­ca­tions are ac­ces­si­ble only within the or­ga­ni­za­tion, which is es­pe­cial­ly important when handling sensitive in­for­ma­tion or data subject to U.S. reg­u­la­tions such as HIPAA, CCPA/CPRA, or industry-specific com­pli­ance re­quire­ments.

Private clouds provide a high degree of control, but they involve sub­stan­tial ad­min­is­tra­tive effort and higher costs, as main­te­nance, op­er­a­tions, and security remain entirely the company’s re­spon­si­bil­i­ty.

Public cloud

A public cloud is delivered over the internet and managed by a third-party provider. The provider handles in­fra­struc­ture main­te­nance, security measures, system updates, and scal­a­bil­i­ty. Or­ga­ni­za­tions benefit from maximum flex­i­bil­i­ty and avoid the cost and effort of running their own hardware. Public cloud services are stan­dard­ized, rapidly de­ploy­able, and par­tic­u­lar­ly well suited for dynamic or fluc­tu­at­ing workloads.

Hybrid cloud

The hybrid cloud combines elements of both models. Highly sensitive or business-critical data remains on-premises or within a private cloud, while less sensitive ap­pli­ca­tions and workloads run in the public cloud. This approach allows or­ga­ni­za­tions to meet com­pli­ance and security re­quire­ments while still taking advantage of the flex­i­bil­i­ty and scal­a­bil­i­ty offered by public cloud services.

How is data stored in a cloud?

Data in the cloud is managed much like files on a local hard drive, meaning it can be accessed, edited, moved, or deleted as needed. The dif­fer­ence is that access happens through web in­ter­faces, apps, or syn­chro­niza­tion clients that create a dedicated cloud folder on your device instead of using a physical drive. From any connected device, users can create folders, upload documents, modify files, or remove them. Modern cloud platforms also offer features such as automatic syn­chro­niza­tion, file ver­sion­ing, shared work­spaces, and secure backups of databases, smart­phones, and other endpoints.

Within the data center, in­for­ma­tion is encrypted and typically stored re­dun­dant­ly—often using dis­trib­uted object storage systems. Data transfers between user devices and the cloud are protected through encrypted con­nec­tions such as TLS. The cloud provider manages internal data or­ga­ni­za­tion, re­dun­dan­cy, and routine backup processes.

For providers with data centers in the United States, com­pli­ance depends on ap­plic­a­ble federal and state reg­u­la­tions as well as industry standards, such as HIPAA, CCPA/CPRA, SOC 2, or NIST frame­works. These reg­u­la­tions define strict re­quire­ments for data pro­tec­tion, access controls, physical safe­guards, and logging. As a result, stored data is protected through com­pre­hen­sive technical and or­ga­ni­za­tion­al measures and remains reliably available.

When does using a cloud make sense?

Whether adopting a cloud solution makes sense depends on several factors and cannot be de­ter­mined solely by the amount of data involved. The key con­sid­er­a­tions are how flexible, secure, and cost-efficient the or­ga­ni­za­tion’s IT in­fra­struc­ture needs to be. A thorough cost-benefit analysis should compare in­vest­ments in hardware, main­te­nance, software licenses, personnel, and future capacity re­quire­ments with the recurring costs of cloud services.

With cloud solutions, expenses for main­te­nance, updates, security, and hardware upgrades are typically included in the service fees. The provider centrally manages the in­fra­struc­ture and keeps it up to date au­to­mat­i­cal­ly. This reduces the burden on companies to operate and secure their own servers or to purchase and maintain on-premises software licenses.

Many providers also offer a free entry option, such as limited storage plans or trial periods. This enables or­ga­ni­za­tions to move initial workloads to the cloud and gain practical ex­pe­ri­ence before tran­si­tion­ing larger or mission-critical systems.