hlight
version: '3.4'
volumes:
  data:
networks:
  frontend:
  backend:
services:
  web:
    image: app:latest
    volumes:
    - "data:/data"
    - "./code:/app"
    networks:
    - frontend
    - backend
    ports:
    - "80:8080"
  redis:
    image: redis:latest
    networks:
    - backend
```

???

- Notice the indentation, that's not just to make it pretty
- This defines 1 volume, 2 networks, and 2 services
- The redis service is only on the backend network, no published port
  - Access via "redis:6379