This command runs a Docker container named "portainer" based on the "portainer/portainer-ce:latest" Docker image.
docker run -d -p 66666:8000 -p 66667:9000 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:latest
starts the container in the background. The "-p" flag binds two container ports (8000 and 9000) to two host ports (66666 and 66667) respectively, allowing access to the portainer web interface from outside the container.
sets the name of the container as "portainer". The "--restart" flag ensures that the container is always restarted automatically if it stops or if the Docker daemon is restarted.