What the cloud really is — Technology, 11–13 years
The cloud is not a mysterious place in the sky. It means using computers in distant data centres to store or process things through a network.
The idea
When an app saves something in the cloud, the data is stored on computers somewhere else, not only on your device. You reach it through a network, often from several devices. The service may also copy data between machines so it keeps working if one has a problem.
Why it was needed
Keeping everything on one device is limiting: it may run out of space, break or be left at home. Remote storage makes sharing and using the same file on different devices easier. It solves these problems by moving some work to a provider, but it also creates dependence on that provider and the network.
A worked example
You take 12 photos, each 4 megabytes in size. First, 12 × 4 = 48 megabytes, so the upload needs at least that much data before any compression. After uploading, your tablet can open the photos through the service, while the original files remain stored on its remote computers.
The common trap
People sometimes think that cloud files exist everywhere automatically or that they need no protection. In reality, they sit on particular computers run by a company, and access can fail when the network is down or an account is lost. The name sounds weightless, so this mistake is easy to make.
Where it appears
Cloud services appear when documents are edited by a group, photos are backed up, or a game continues on a different device. Streaming also sends content from a provider’s computers instead of storing every film on your device. These services are useful, but they need a connection and a trustworthy provider.
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