This section introduces configuring AWS infrastructure to support high availability (HA) to our application. Amazon's high-level services are designed for high availability and fault tolerance like the Elastic Load Balancer (ELB),Simple Storage Service (S3), Simple Queue Service (SQS), Simple Notification Service(SNS), Relational Database Service(RDS), Route 53 a dynamic DNS service, and Cloudwatch. The infrastructure services, such as Elastic Cloud Compute (EC2) and Elastic Block Storage (EBS), can leverage Availability Zones, Elastic IP addresses and snapshots to design highly available and fault tolerant applications and deployment environments. Remember that hosting an application on the cloud does not make it fault tolerant or highly available. We need to architect for high availability.