Auto Scaling Groups in AWS are used to automatically scale your Amazon EC2 instances in response to changes in load.
There are three types of scaling activities:
* **Manual** scaling: You manually add and remove instances from the group.
* **Dynamic** scaling: You specify the desired capacity, and Amazon EC2 Auto Scaling automatically adds and removes instances to maintain that capacity.
* **Scheduled** scaling: You specify a schedule for Amazon EC2 Auto Scaling to add or remove instances.
To create an Auto Scaling group, you must specify the following:
* **Name**
* **VPC**
* **Launch configuration**
* **Min/max/desired capacity**
* **Health check type**
* **Scaling policies**
You can also specify the following optional settings:
* **Instance tags**
* **Notification Configurations**
* **LoadBalancers**
Once you have created an Auto Scaling group, you can use the following commands to manage it:
* **aws autoscaling describe-auto-scaling-groups**
* **aws autoscaling create-auto-scaling-group**
* **aws autoscaling delete-auto-scaling-group**
For more information, see the [AWS Auto Scaling documentation](https://docs.aws.amazon.com/autoscaling/ec2/userguide/).
