To ensure an AWS workload remains operational when components fail, what is an AWS best practice?

Designing for automatic failover to healthy resources is an AWS best practice for ensuring workload operational continuity. This involves distributing components across multiple Availability Zones or Regions and implementing mechanisms (like Elastic Load Balancing, Auto Scaling, or Route 53 failover routing policies) that automatically redirect traffic to healthy instances or services when failures occur. This approach minimizes downtime and enhances resilience. Performing quarterly disaster recovery tests is important but focuses on recovery, not continuous operation during component failure. Placing the main component in a specific Region like us-east-1 doesn't inherently provide resilience; it's about how resources are deployed within or across Regions. Designing workloads to fit on a single Amazon EC2 instance is a single point of failure and directly contradicts best practices for high availability.