What service is best suited for running containerized applications without managing servers?

The correct service for running containerized applications without the need to manage servers is AWS Fargate. This fully managed compute engine for Amazon ECS (Elastic Container Service) and Amazon EKS (Elastic Kubernetes Service) enables you to run containers without having to provision or manage the underlying infrastructure. With Fargate, you simply specify the desired CPU and memory requirements, and the service handles the rest, including task provisioning, scaling, and the infrastructure management.

This allows developers to focus on building and deploying their applications while eliminating the complexity of server maintenance and management. Fargate abstracts the server layer, making it possible to run containerized applications in a serverless manner, which aligns with the growing trend of "serverless computing."

In contrast, Amazon S3 is an object storage service and does not cater to running applications or containers. AWS Elastic Beanstalk provides an environment for deploying applications, including those running in containers, but it requires you to manage the underlying instances and scaling options. Lastly, AWS CloudFormation is a service used for deploying AWS infrastructure as code, which involves defining and provisioning AWS resources, rather than directly running applications. Thus, Fargate stands out as the most appropriate choice for container management without server oversight.