Horizontal scaling, or scaling out, involves adding more instances or containers to handle increasing workloads in a cloud environment. This approach in Amazon ECS (Elastic Container Service) is beneficial for maintaining application performance and availability during traffic spikes. As applications become more complex and user demand grows, horizontal scaling is critical to ensure seamless user experiences.
https://businesscompassllc.com/navigating-horizontal-scaling-in-ecs-lessons-learned-from-response-time-based-autoscaling/