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What You Will Learn
Beginner
- What regions and availability zones are
- Why they matter for reliability
- How to choose the right region
Region
A region is a geographical location (e.g., us-east-1 = Virginia, ap-south-1 = Mumbai). Each region is independent — data does not cross regions without your action.
Availability Zone (AZ)
Each region has 2-6 availability zones — isolated data centers with independent power, cooling, and networking. If one AZ fails, others keep running.
| Concept | Example | Failure isolation |
|---|---|---|
| Region | us-east-1 (Virginia) | Geographic isolation |
| Availability Zone | us-east-1a, us-east-1b | Data center isolation |
Best practice
Deploy across at least 2 AZs for high availability. If one data center goes down, your app keeps running from the other.Practical Exercise
Go to AWS Console
Check which region you are in (top right corner)
Switch to a different region and notice the services are empty
Search for "AWS regions list" to see all regions
Key Takeaways
- Regions are geographical locations (Virginia, Mumbai, Tokyo).
- Each region has 2-6 Availability Zones (isolated data centers).
- Deploy across 2+ AZs for high availability.
- Choose the region closest to your users for low latency.
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