Region

• Combination of data centers
• Data centers are called AZ, i.e. Availability Zone

AZ

• Availability Zone
• In region, couple of AZ exists
• AZ are isolated each other, so Disaster in one AZ does not impact on other AZ

AZ and Region

• Some service are AZ scoped
• Some services are Global scope
• AZ name can be us-east-1a, us-east-2b
• Region name be us-east, us-west
• AZ names are randomized according to the Account
• us-east-1a in one account could be us-east-1b to another account