AWS global infrastructure powers AWS infrastructure services such as Amazon EC2, Amazon VPC and Amazon Elastic Block Storage (EBS). These are regional services; that is, they operate within the region where they have been launched. They have different durability and availability objectives. However, it is possible to build systems exceeding availability objectives of individual services from AWS. AWS provides multiple options to use various resilient components in multiple availability zones inside a region to design highly available systems.
The following figure shows this model: