Which service can be utilized for automatically scaling resources in AWS?

AWS Auto Scaling is specifically designed to automatically adjust the number of Amazon EC2 instances or other resources based on defined policies and real-time metrics. This service ensures that applications maintain performance and cost efficiency by scaling resources up or down according to the demand.

When demand increases, Auto Scaling can add more instances to handle the excess load, and as demand decreases, it can terminate instances to reduce costs. It operates by monitoring metrics such as CPU utilization, request counts, or custom CloudWatch metrics, allowing for flexible and dynamic resource management.

Other options, while beneficial in their own contexts, are not intended for automatic resource scaling in the way Auto Scaling is. Elastic Load Balancer distributes incoming application traffic across multiple targets but does not scale resources by itself. AWS CloudFormation automates the deployment of resources and infrastructure as code, allowing for consistent infrastructure setup but does not include scaling capabilities. AWS Lambda executes code in response to events but operates on a serverless model where provisioning and scaling is managed automatically by AWS, rather than within a user-defined scaling policy framework like Auto Scaling provides.