One of the most appealing benefits of cloud deployment is the ease of use and the flexibility of adding or removing compute capacity. You can dynamically allocate resources based on the changing workloads, which give you the flexibility in managing your compute cost.
AWS Auto Scaling enables you to closely follow the demand curve for your applications, reducing the need to provision Amazon EC2 capacity in advance. For example, if your CPU Utilization goes over 70% you can add additional EC2 instances. Similarly, if your CPU Utilization goes down above a threshold, you can remove EC2 instances.