A Docker container is lightweight virtualization of one or more processes using OS namespaces and control groups (cgroups). It's also includes a system for "composing" containers out of additional packages and setup steps.
You don't SSH into a docker container. You can run an instance of bash in a container using:
docker exec -it $CONTAINER_ID /bin/bashYou can use the ID number or the name, e.g. gifted_davinci, that is listed when you do docker ps.