Amazon Elastic Container Service (Amazon ECS) is a fully managed container orchestration service.
You can choose to run your ECS clusters using AWS Fargate, which is serverless compute for containers. Fargate removes the need to provision and manage servers, lets you specify and pay for resources per application, and improves security through application isolation by design.
As a result of the previous step you have your AWS CodePipeline building container image and pushing it into Amazon ECR.
Next step is to run your containerized application in Amazon ECS using AWS Fargate.