Which of the following AWS tools help your application scale up or down based on demand?

The correct answer highlights the use of Elastic Load Balancing and Auto Scaling, both of which are powerful tools designed specifically for managing application scalability in response to varying levels of demand.

Elastic Load Balancing automatically distributes incoming application traffic across multiple targets, such as EC2 instances, which ensures that no single instance is overwhelmed by too much traffic while others remain underutilized. This load distribution enhances the availability and fault tolerance of your applications.

Auto Scaling complements this by automatically adjusting the number of EC2 instances in your application environment based on the current demand. It can scale out (add more instances) when traffic increases and scale in (remove instances) when the demand decreases, thus optimizing resource utilization and reducing costs.

Together, these tools allow applications to respond dynamically to changing conditions, ensuring they remain performant and cost-effective without requiring manual intervention. The synergy between load balancing and auto scaling is essential for building resilient cloud-based applications that adapt to unpredictable traffic patterns and maintain a seamless user experience.