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What is cloud computing? IaaS vs PaaS vs SaaS with examples.
FresherFundamentalsCloud Basics
Cloud service models
For What is cloud computing? IaaS vs PaaS vs SaaS with examples., interviewers listen for a crisp definition, how the pieces interact in a real system, and one trade-off or failure mode you have seen or would guard against.
| Model | You manage | Provider manages | Example |
|---|---|---|---|
| IaaS | OS, app, data | Hardware, network | EC2, Azure VM |
| PaaS | App, data | + runtime | Heroku, App Engine |
| SaaS | Users, config | Everything | Gmail, Salesforce |
On-prem vs cloud: capex vs opex, elasticity in minutes.