Amazon ECS is a service that manages which type of workloads?

Amazon ECS (Elastic Container Service) is specifically designed to manage Docker containers. It allows users to easily run, stop, and manage Docker containers on a cluster of EC2 instances or using AWS Fargate, which is a serverless compute engine. ECS handles the deployment, scaling, and load balancing of applications packaged in containers, enabling developers to focus on building their applications without worrying about the underlying infrastructure.

This service supports the orchestration of microservices architectures, allowing applications to be broken down into smaller, manageable, isolated components that can be developed, deployed, and scaled independently. The integration with the rest of the AWS ecosystem facilitates the use of other AWS services such as load balancers, IAM, and networking features.

The other options refer to different types of workloads that do not align with the specific capabilities of ECS. Virtual machines relate to services like Amazon EC2, while web hosting may involve various AWS offerings, not limited to containers alone. Databases are managed by services like Amazon RDS or DynamoDB, which again do not involve container management. Thus, the distinction that ECS is focused on orchestrating and managing workloads through Docker containers makes it the correct answer.