In this video, Trion Kim, a container specialist Solutions Architect at Amazon Web Services, explains ECS Auto Scaling with a focus on target tracking scaling. He covers the fundamentals of auto scaling in Amazon Elastic Container Service (ECS), including task resource limits, scaling metrics, and three types of scaling policies: target tracking, step scaling, and scheduled scaling. The video includes a detailed demonstration of target tracking scaling based on average CPU utilization, showcasing how ECS automatically adjusts the number of tasks to maintain a target CPU utilization percentage. Kim also explains how to set up and monitor auto scaling using the ECS console and CloudWatch. This informative session provides valuable insights for those looking to optimize their containerized applications' performance and resource utilization on AWS.