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What is cloud computing?

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Engineering Notes · AI Systems

The outage at a single cloud computing provider briefly took thousands of unrelated websites offline.

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Overview

Cloud computing is renting computing over the internet instead of owning the machines yourself. The computers, storage, and software sit in a provider's data centers, you reach them through the internet, and you pay for what you use. Most familiar apps run this way, from web email to photo backups, on machines their makers rent rather than own.
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Overview

Cloud computing is the discovery that most of us want computing, not computers, the way you want water without digging a well. So a few giant providers filled warehouses with machines, and now everyone rents by the hour. Programmers have a sticker for it: there is no cloud, it is just someone else's computer. Correct, and that is the selling point. Someone else's computer means someone else's 3 a.m. repair shift. 😎

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Detail

Cloud computing means using computers you rent over the internet instead of machines you own. The hardware sits in data centers run by a provider, you reach it from anywhere, and you pay for what you use. Most people already use it all day: web email, photo backups, and streaming all run in provider data centers, and most companies build their apps on rented machines the same way. Renting won for two reasons. First, you can change your order in minutes. A shop that needs one server in March and two hundred for a holiday sale rents the extra machines for a week and hands them back. Owning would mean buying for the busiest day and idling the rest of the year. Second, the provider does the unglamorous work: replacing failed drives, patching systems, cooling the halls. The counterweight is that rent adds up. A company with a large, steady, predictable workload can find owning cheaper, and some that grew up in the cloud later move parts back onto their own machines. The boundary is worth knowing too. Software running purely on your own device is not cloud, and the internet itself is not either. The internet is the road; cloud computing is renting the buildings you reach by it.
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Detail

Cloud computing is renting computers over the internet, and once you see it, it is everywhere. Your photo backups are not in your phone, they live in a building in Virginia or Frankfurt. Your smart doorbell is a camera plus a rented server. Half the apps on your phone are thin windows onto machines their makers rent. That is why a big provider outage is such a strange day: the doorbell, the bank app, and a food delivery service all sulk at once, tenants of the same landlord. Renting has its own moods. Scaling up is glorious, one click and you have two hundred servers. The bill is the plot twist, because pennies per hour times two hundred servers times forever is real money, and getting your data back out is often priced like the minibar. That is why cloud regret is a genre: companies that scaled up gloriously, met the bill, and quietly bought their own machines again. None of it means the cloud was a trick. It means rent versus own is an old question, and it followed the computers. 😎

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Analogy

Cloud computing did to computers what the power grid did to electricity. Early factories ran their own generators, with the fuel, the mechanics, and the breakdowns. The grid turned power into something you plug into: use more on a busy day, less on a quiet one, and pay by the meter while the utility keeps the plant running. Renting computing works the same way, down to the fine print. When the grid fails, every factory on it goes dark together, and when a big cloud provider stumbles, half the internet stumbles with it. And the biggest factories still sometimes build their own plant, because past a certain size, the meter costs more than the plant.
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Analogy

Cloud computing is taking taxis instead of owning a car. No purchase, no oil changes, no parking: a ride exists exactly when you want one and stops costing you the moment you step out. Need forty cars for a wedding? Book forty, hand them back Monday. Try that with ownership. The fare is the catch, though. Ride everywhere, every day, and by year's end you have paid for a car you do not have. That is when heavy riders do the math and buy their own again. Renting wins when your needs jump around, heavy one week and quiet the next. Owning wins when you drive the same long route every single day. 😎
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Formal definition — The same term, explained the usual way

Cloud computing is the on-demand delivery of computing resources, including processing, storage, networking, and software, over the internet from shared data centers, with usage-based pricing in place of resource ownership. Its defining characteristics include on-demand self-service, rapid elasticity of capacity, and metered consumption. Offerings are commonly delivered as infrastructure, platforms, or complete software services, and may be public, private to one organization, or a hybrid of the two.

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