Final answer:
Auto Scaling is an implementation of adjusting compute capacity dynamically to reduce cost in the AWS cloud.
Step-by-step explanation:
Adjusting compute capacity dynamically to reduce cost is an implementation of Auto Scaling best practice in the AWS cloud. Auto Scaling allows you to automatically scale your Amazon EC2 instances based on the demand, ensuring that you have enough compute resources available when needed and reducing costs when the demand decreases. This feature is especially useful for applications with variable workloads.