Cloud Computing

Cloud Computing is a model for delivering computing services—such as servers, storage, databases, software, networks, and artificial intelligence—over the Internet ("the cloud"). Instead of owning, buying, and managing their own physical infrastructure (hardware and software) on-premises, companies and users can "rent" these resources on-demand from a cloud service provider.

What it is for / why it is important

It serves to eliminate the costs and complexity associated with managing proprietary IT infrastructure. It is fundamental because it offers flexibility, scalability (computing power can be increased or decreased in minutes), and a pay-as-you-go cost model (you only pay for what you use). This allows companies to innovate faster, reduce costs, and improve efficiency, delegating maintenance and security to specialised providers.

When it is used / in what context it is useful

Almost all of us use it, every day. It is the model on which streaming services (e.g., Netflix), file storage (Google Drive, iCloud), web-based email (Gmail), and online software (Google Docs, Office 365, Canva) are based. In a business context, it is the standard environment for hosting websites, e-commerce, developing apps, and processing large amounts of data (Big Data).

Practical example

A startup wants to launch a new e-commerce site. Instead of buying expensive physical servers, installing them in an office, and hiring technicians for maintenance, it decides to use the cloud. It "rents" virtual servers, a database, and storage space from a provider like Amazon Web Services (AWS) or Google Cloud. If the site has a peak of 100,000 visitors during Black Friday, it can automatically scale to handle the traffic, then return to normal resources (and normal costs) the next day.