Amazon EC2 Auto Scaling helps you ensure that you have the correct number of EC2 instances available to handle the load for your application. You create collections of EC2 instances called Auto Scaling groups. Amazon EC2 Auto Scaling makes sure your group always has the number of instances that you have specified to meet your desired capacity. If you specify scaling policies, then Amazon EC2 Auto Scaling can launch or terminate instances on demand as your application load increases or decreases.