Elastic Container Service

A highly scalable, fast container service that makes it easy to run, stop, and manage containers on a cluster. (Cluster here could be many things, e.g. Fargate or EC2)

Security

ECS Task Execution Role

Allows ECS container and Fargate agents to make API calls.

https://aws.amazon.com/blogs/compute/building-blocks-of-amazon-ecs/

Services

ECS Service allows you to run and maintain a specified number of instances of a task definition simultaneously in an Amazon ECS cluster.