Docker Compose is a component of the Docker Toolbox that enables developers to launch multiple Docker containers with a single command-line tool, streamlining deployment and integration testing. It is particularly useful for rapid development iterations and integrating into continuous integration pipelines, such as those on Codefresh. Compose allows for the configuration and linking of multiple containers within a single manifest, providing a powerful way to manage distributed deployments. The post provides a guide to setting up Compose, including verifying installation, configuring the `docker-compose.yml` file with services like a Postgres database and a Java web server, and using commands to manage and test the environment. By integrating Compose into a continuous integration platform, developers can automate build steps triggered by code changes, enhancing project integrity and enabling early feedback.