What is Docker Swarm?

Docker Swarm is Docker's native clustering and orchestration tool, designed to manage a group of Docker engines called a swarm. This capability allows users to create and manage a cluster of Docker nodes, simplifying container deployment and scaling across multiple hosts. With Docker Swarm, you can easily configure and manage services, ensure high availability, and distribute tasks among the various nodes in your cluster. It facilitates load balancing, rolling updates, and service discovery, making it an essential tool for managing containerized applications in a production environment.

In contrast, other options do not pertain to the orchestration capabilities of Docker Swarm. For example, a tool for building Docker images refers to Docker itself or related build tools, while a plugin for Docker Desktop indicates an extension or additional feature rather than a core functionality. Additionally, a command to manage containers does not capture the broader scope and orchestration capabilities provided by Swarm in a multi-host context.