Stop 01 · Cloud Computing FoundationsTopics · 1/9

What Cloud Computing Actually Is

In short

Netflix, your college portal and that startup your senior joined probably don't own a single server. They rent computers by the second from someone else. That's the whole trick.

Renting compute, storage and networking on-demand from a provider instead of owning physical hardware — paying only for what you use, and scaling up or down within minutes instead of months.

The blob character carries folding chairs and a rolled tent out of a rental shop.

Think of it like this

The tent-house for a wedding

Nobody buys 500 chairs and a shamiana for one function. You call the tent-house, they set it up by evening, and it goes back after the party. The cloud is a tent-house for computers.

Watch it happen

Renting a server in one minute

You

Cloud console

Data centre

Launch 1 small VM

1/5You pick a size and a region in the provider's website or CLI. No purchase order, no waiting for delivery.

The big ideas

What you need to know

On demand

You get servers, storage or databases in minutes through a website, a command or code. No buying hardware first.

Pay for what you use

Most services bill by the second, hour or gigabyte. Switch something off and that part of the bill stops.

Scale up and down

Need 50 servers for exam-result day and 2 the next week? You can do that without buying 50 machines.

Someone else runs the buildings

Power, cooling, cables, broken disks and security guards are the provider's problem, not yours.

See it in code

A tiny example

bash

1# List the regions your AWS account can use2aws ec2 describe-regions --output table3 4# Same idea on Google Cloud and Azure5gcloud compute regions list6az account list-locations --output table

Each provider has data centres grouped into regions around the world. You choose where your rented machines live.

Save yourself the pain

Common mistakes

Oops

Thinking the cloud is some magic place with no real computers.

Do this instead

It's real servers in real buildings. You just rent slices of them instead of owning them.

Oops

Assuming cloud is always cheaper than owning servers.

Do this instead

It's cheaper when usage changes a lot or you're small. A big, steady workload can cost more if you never switch anything off.

Your mission

Spot the cloud around you

~15 min

Quick check

A college fest site gets huge traffic for 3 days a year and almost none otherwise. Why is the cloud a good fit?

Go deeper

1Read 2-3 'day in the life of a cloud engineer' posts from different companies.
2List 3 things that used to take weeks (buying servers) that the cloud reduced to minutes.
3Notice cloud computing is a delivery model, not a single technology or product.