How Does the Cloud Work?
The cloud is a network of remote servers that store and process data instead of your local device. You access it over the internet through apps or browsers, while the physical machines handle the heavy lifting in data centers around the world.
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Core Concepts
- Virtualization: A single physical server runs multiple virtual machines, each isolated and allocated its own share of CPU, memory, and storage.
- Data centers: Large facilities house thousands of servers with redundant power, cooling, and network connections to keep services available.
- Redundancy: Data is typically copied across multiple machines or locations so that a single hardware failure does not cause loss.
How You Interact With the Cloud
When you save a file to cloud storage or run an app online, your device sends a request over the internet to a provider's servers. Those servers process the request, read or write data, and send the result back. The software and infrastructure are managed by the provider, so you do not need to maintain hardware or install complex systems locally.
Common Cloud Service Models
| Model | What It Provides | Example Use |
|---|---|---|
| SaaS | Ready-to-use applications hosted online | Email, office suites, CRM tools |
| PaaS | Environment for building and deploying apps | Web app hosting, databases |
| IaaS | Virtualized computing resources | Servers, storage, networking on demand |
Why the Cloud Matters
Cloud computing lets individuals and businesses scale resources up or down based on demand, pay only for what they use, and access services from almost anywhere. The reliability of the cloud depends on the provider's infrastructure, your internet connection, and how data is configured and secured.