What is the primary advantage of using Auto Scaling Groups alongside Elastic Load Balancers?

The primary advantage of using Auto Scaling Groups alongside Elastic Load Balancers is scaling resources based on demand. Auto Scaling automatically adjusts the number of Amazon EC2 instances in your application in response to changing traffic patterns. This means that during periods of high demand, Auto Scaling can launch additional instances to handle the workload, ensuring that your application remains responsive and performant. Conversely, it can terminate instances when the demand decreases, optimizing resource use and cost.

When integrated with Elastic Load Balancers, which distribute incoming application traffic across multiple instances, auto scaling ensures that the load is balanced efficiently among the available instances. This synergy allows for seamless scaling without manual intervention while maintaining a consistent user experience.