True or False: A task definition in AWS specifies the number of containers needed and their linking.

A task definition in AWS ECS (Elastic Container Service) is a vital blueprint that outlines how your application needs to run. It indeed specifies the number of containers needed for a particular task and details their configuration, including linking between them if required. Each task definition includes important information such as the Docker image to use, the CPU and memory requirements, and the environment variables, as well as the network settings.

In this context, the correct answer reflects a key component of AWS ECS architecture, where a task can consist of multiple containers that may be defined to work together. Therefore, a task definition is essential for managing containerized applications, as it encapsulates both the number of containers and how they interact with each other.

Understanding the structure and function of task definitions is crucial for leveraging AWS ECS effectively, particularly when planning for distributed applications or microservices.