Docker Swarm and Docker Compose now work together, allowing for simplified deployment of multi-container applications on multi-host environments. Docker 1.13 introduced a new version of Docker Compose that enables services defined in Docker Compose files to be directly deployed to Docker Engine enabled with Swarm mode. To deploy a Docker Compose file to Docker Swarm mode, use the `docker stack deploy` command. This allows for the creation of a cluster of Docker Engines and enables multi-host applications with simplified deployment. The new version of Docker Compose also introduces changes in syntax, such as the updated `version` attribute and other improvements.