AWS-ASG (Amazon Auto-Scaling Group)

An Amazon Auto-Scaling Group (ASG) is a logical group of Amazon EC2 instances with identical features. ASG is a cloud services technology that allows for the appropriate allocation of computational resources. Every Amazon EC2 instance in the group must adhere to auto-scaling policies. The number of occurrences in ASG is used to calculate the size of ASG. It's also known as auto-scaling or automated scaling. As a user's needs change, the number of active servers will also change automatically depending on the demand on the group servers.

The ASG is widely used to monitor applications and automatically adjust capacity to maintain a steady and predictable performance at the lowest possible cost. It also makes it easy to set up application scaling.