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What is cloud computing? Why is it used and for what purposes?

P: 53
Hello,

please explain cloud computing in simple terms and real-life example of cloud computing.and what is the purpose cloud computing.
3 Weeks Ago #1
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Expert 100+
P: 260
That's a quite broad term. How about using the interwebs and then discussing the parts you're having difficulty understanding?
3 Weeks Ago #2

Banfa
Expert Mod 5K+
P: 8,949
In the simplest of terms cloud computing is just the next step on from virtualisation.

If a company is running a virtualisation stack then basically it has separated the requirement for services and systems from the requirement for hardware so it will have a large hardware virtualisation resource with multiple processors large amounts of ram and disk space. Then as required it creates virtual machines on the hardware stack for specific services or in some cases to provide machines.

The problem here is that if the company runs out of space on its hardware stack for all the services and machines it wishes to stand up it needs to go through the normally long and costly processes of acquiring new hardware.

Cloud computing solves this problem by removing the hardware from the company entirely, a third party (e.g. Amazon, Microsoft, Google, IBM, Adobe etc) provides the hardware and the company effectively rents space to stand-up servers and services in the cloud without every owning the hardware. This has a couple of advantages, no hardware maintenance or up-grade costs and you can always get more if you need it. In fact the you can always get more is built into some of the contracts so that if the demand for you service spikes the could service will automatically stand up extra instances of your service to handle the demand and stand them back down when the spike is over, you only get charged for what you are using when you are using it.

This has now come full circle with companies like Microsoft selling their cloud platform so that if you don't like the idea of a cloud on someone else's servers you can set-up your own private cloud on your own hardware.

This is where terms such as Software as a service (SaaS), Platform as a Service (PaaS) and Infrastructure as a Service (IaaS) come from, in all cases you are not buying any actual hardware by you are buying a service that makes a virtual implementation of hardware available to you.
3 Weeks Ago #3

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