Docker Compose was previously called Fig, but Docker acquired Fig and the name was changed. This is how Docker describes Docker Compose:
"Compose is a tool for defining and running complex applications with Docker. With Compose, you define a multi-container application in a single file, then spin your application up in a single command which does everything that needs to be done to get it running."
Docker Compose basically gives us a way to define settings in a configuration file, so we don't have to remember all the names for all the containers when linking them together, the ports to expose, the data volume container to use, and so on.
Docker Compose has regular releases on GitHub, ...