What is one of the primary purposes of Docker Swarm?

One of the primary purposes of Docker Swarm is to manage the deployment of multi-container applications. Docker Swarm provides a native clustering and orchestration solution for Docker containers, enabling users to easily deploy and manage applications that consist of multiple interdependent containers across a distributed cluster of machines.

This capability is crucial in modern software development and deployment because applications often involve multiple services that need to communicate with each other. Docker Swarm handles service discovery, load balancing, scaling, and failover for these multi-container applications, allowing developers and system administrators to focus on building and deploying their applications without having to manage the underlying complexities of container orchestration manually.

The other options focus on different aspects of Docker's functionality. Simplifying the building of Docker images is managed by tools like Dockerfile and Docker build, which are separate from the orchestration features of Swarm. Tracking container usage and limits pertains to resource monitoring and management, which is handled through different Docker commands and configurations, rather than Swarm itself. Facilitating Docker CLI commands refers to the ease of using the command-line interface to issue instructions to Docker but does not address the specific role of Swarm in managing containerized applications.