Ans. Amazon EC2 Auto Scaling can launch or terminate instances as demand for your application increases or decreases. For example, the following Auto Scaling group has a minimum size of one instance, two instances’ desired capacity, and four instances’ maximum size.
Simple scaling relies on a metric as a basis for scaling. For example, you can set a CloudWatch alarm to have a CPU Utilization threshold of 80%, and then set the scaling policy to add 20% more capacity to your Auto Scaling group by launching new instances.
The dynamic scaling capabilities of Amazon EC2 Auto Scaling refer to the functionality that automatically increases or decreases capacity based on load or other metrics. For example, if your CPU spikes above 80% (and you have an alarm setup) Amazon EC2 Auto Scaling can add a new instance dynamically.