Docker Swarm is a native clustering and orchestration tool for Docker containers. It allows users to manage a group of Docker engines, known as a swarm, as a single virtual system. This simplifies the deployment and scaling of applications across multiple machines, ensuring high availability and load balancing. With Docker Swarm, users can easily create and manage services, which are long-running tasks that can be scaled up or down based on demand. It provides built-in features for service discovery, load balancing, and rolling updates, making it a powerful solution for container management in production environments.