Cloud Computing: Common Questions Answered
"The cloud" is one of the most used and least explained terms in technology. This page answers the questions people ask most often, without jargon where it can be avoided.
What is the cloud, really?
The cloud is computing power, storage and software that you use over the internet instead of running on your own hardware. The servers still exist; they sit in large data centres operated by a provider. You rent what you need and access it through a browser, an app or a programming interface.
What do IaaS, PaaS and SaaS mean?
These abbreviations describe how much of the stack the provider manages for you:
- Infrastructure as a Service (IaaS): you rent virtual machines, storage and networking. You install and manage the operating system and software yourself.
- Platform as a Service (PaaS): the provider runs the operating system and runtime; you supply your application code and data.
- Software as a Service (SaaS): you use a finished application, such as web-based email, document editing or accounting software. The provider manages everything underneath.
Most individuals and small organisations use the cloud mainly through SaaS products, often without thinking of them as "cloud" at all.
What is the difference between public, private and hybrid cloud?
A public cloud shares a provider's infrastructure among many customers, kept logically separate. A private cloud dedicates infrastructure to one organisation, either on its own premises or hosted by a provider. A hybrid setup combines the two, for example keeping some systems in-house while using public cloud services for others.
Why do organisations move to the cloud?
- Elasticity: capacity can be increased or reduced as demand changes, rather than buying hardware for the busiest day of the year.
- Lower upfront cost: spending shifts from buying equipment to paying for usage.
- Less maintenance: the provider handles hardware failures, power and cooling.
- Access from anywhere: services are reachable from any connected device, which suits distributed teams.
Is the cloud always cheaper?
Not necessarily. Pay-as-you-go pricing is efficient for variable workloads, but steady, predictable workloads can sometimes cost more over several years than owning equipment. Costs can also grow quietly through forgotten resources, data transfer charges and storage that is never cleaned up. Setting budgets and alerts and reviewing bills regularly helps keep spending under control.
Is my data safe in the cloud?
Large providers invest heavily in physical and technical security, but security is shared. Cloud providers commonly describe a shared responsibility model: the provider secures the underlying infrastructure, while the customer is responsible for things like account passwords, who has access, how sharing is configured and what data is uploaded. Many publicised cloud data exposures have come from misconfigured settings, such as storage left open to the public, rather than from the provider being broken into.
Practical steps include two-factor authentication on cloud accounts, giving people only the access they need, and reviewing sharing links.
Where is my data stored, and does that matter?
Data physically lives in specific data-centre regions. Location can matter for legal and regulatory reasons, because some laws restrict where certain kinds of personal data may be processed. Many providers let customers choose a region.
What happens if the provider has an outage?
Outages are rare but do happen. Services you depend on heavily should have a fallback plan, and important data should have a backup that does not depend on a single provider or account.
Can I get my data out again?
Before committing, check what export options exist and in what formats. Being able to move data elsewhere protects you against price changes, service shutdowns and "lock-in", where leaving becomes too difficult or expensive.
Where should a beginner start?
Start with a single, well-understood use such as file storage and sharing, secure the account, and learn how sharing permissions work. From there it is easier to judge which other services are worth adopting. Our homepage explainer places cloud computing alongside other key technologies such as AI and the Internet of Things.