What is Cloud Computing?
If you are new to IT or studying for the Cloud basics to enter into the field of Cloud, "The Cloud" can sound like a magical, invisible place where data floats around in the sky.
But the truth is much simpler: The Cloud is just a computer located somewhere else.
The general definition of cloud :-
Cloud computing is the delivery of computing services over the internet.
Computing services include common IT infrastructure such as virtual machines, storage, databases, and networking.
The "Rental Car" Analogy
Think about owning a car vs. renting a car.
- 🚗 Owning a Car (On-Premises): You pay $30,000 upfront. You have to pay for insurance, change the oil, and fix the tires when they go flat. If you need a bigger truck for one day to move furniture, you are stuck with your small sedan.
- 🚕 Renting a Car (Cloud Computing): You pay $50 to use a car for one day. You don't care about the oil changes or the tire pressure; the rental company handles that. If you need a truck tomorrow, you just rent a truck instead.
Cloud Computing is the rental market for IT. Instead of buying expensive servers (computers) and storing them in your office, you rent computing power from Microsoft Azure over the internet.
Why is everyone moving to the Cloud?
For the AZ-900 exam, you need to know the three main benefits:
1. It's Cheaper (Cost)
You stop paying for physical hardware, electricity, and 24/7 cooling systems. You move from CapEx (Upfront cost) to OpEx (Pay-as-you-go).
2. It's Faster (Speed)
In the old days, ordering a new server took weeks. In Azure, you can click a button and have a server running in minutes.
3. It's Flexible (Scalability)
If your website goes viral overnight, you can instantly add 10 more servers to handle the traffic. When the traffic drops, you turn them off to stop paying. This is called Elasticity.
Real World Examples You Already Use
- Netflix: They don't own all the servers to store movies. They rent space on the cloud to stream video to you.
- Gmail / Outlook: Your emails aren't stored on your phone; they are stored on Google or Microsoft's cloud servers.
- Google Photos: When you run out of space on your phone, you upload photos to the cloud.
Next Lesson: Now that you know what the cloud is, how do you use it?
Check out our famous "Pizza Analogy" to understand IaaS, PaaS, and SaaS.
Read the Pizza Analogy →