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Cloud computing is a delivery model that provides on-demand access to computing resources such as servers, storage, databases, networking, and software over the internet. Instead of purchasing and maintaining physical infrastructure, users consume resources from cloud providers who operate large-scale data centers. The core principles include virtualization, elasticity, scalability, pay-as-you-go pricing, and a shared responsibility model. Cloud environments allow rapid provisioning and deprovisioning of resources, automated scaling based on demand, and global accessibility with built-in redundancy and fault tolerance.
Table
Service Model | What the User Manages | Typical Example |
| IaaS | OS, runtime, apps, data | Virtual servers |
| PaaS | Applications and data | Managed app platforms |
| SaaS | Usage only | Email, CRM software |
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Example
A startup launches a web application without buying any servers. Developers provision virtual servers in minutes and deploy the application. As user traffic grows, additional resources are automatically added. During low usage periods, unused resources are released to reduce costs. The cloud provider handles hardware failures and physical security. This enables the startup to scale quickly while keeping operational overhead low.
Use Cases
• Hosting web and mobile applications
• Running development and testing environments
• Backup and disaster recovery solutions
• Big data processing and analytics
• AI and machine learning workloads
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What is Cloud Computing
