The logo for Docker is a shipping container. Most shipping containers have well-defined standardized dimensions. This way cranes/boats/trucks/trains all over th

The logo for Docker is a shipping container. Most shipping containers have well-defined standardized dimensions. This way cranes/boats/trucks/trains all over the world can handle any container, regardless of what is in it. Docker does this for software. A docker image packaging an application has a well-defined interface to start/stop/configure/log the application, regardless of which language it was written in. This way infrastructure tools (for example container orchestration like Kubernetes, docker-compose, swarm,... but also CI/CD tools and local development environments) can work with all sorts of applications in the same way. Docker (or containers) provide a uniform interface to all of these tools.