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What You Will Learn
Beginner
- What IaaS, PaaS, and SaaS mean
- The difference between them
- When to use each
IaaS gives most control, SaaS gives least management. PaaS is the middle ground.
The Three Models
| Model | What you manage | What provider manages | Examples |
|---|---|---|---|
| IaaS | OS, apps, data | Hardware, networking | AWS EC2, Azure VM, GCP Compute |
| PaaS | Apps, data | OS, runtime, hardware | AWS Lambda, Heroku, App Engine |
| SaaS | Nothing | Everything | Gmail, Office 365, Salesforce |
Rule of thumb
IaaS = most control, most work. SaaS = least control, least work. PaaS = the sweet spot for developers.Practical Exercise
Identify 5 SaaS apps you use daily (Gmail, Slack, etc.)
Search for "AWS EC2" (IaaS) and "AWS Lambda" (PaaS)
Note the difference in management responsibility
Key Takeaways
- IaaS: you manage OS + apps. Provider manages hardware.
- PaaS: you manage apps only. Provider manages OS + runtime.
- SaaS: provider manages everything. You just use it.
- More control = more work. Less control = less work.
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