- An Availability Zone (AZ) is a datacenter owned and operated by AWS in which the AWS services run
- Each AWS Region has atleast two Availability Zones, with a maximum of 6 Zones.
- Availability Zones are represented by a Region Code, followed by a letter identifier
- For example, US-East-1 has 6 Availability Zones:
- US-East-1a
- US-East-1b
- US-East-1c
- US-East-1d
- US-East-1e
- US-East-1f
- One cannot choose an Availability Zone directly, one can choose a subnet which correlates to an Availability Zone
- choosing a Multi-AZ infrastructure distributes instances across multiple Availability Zones, which allows fail over for handling requests when one AZ goes down.
- This results in high-availability
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