The video tutorial explains the process of using Docker for application containerization. It covers the creation of Docker images, their storage in container registries, and the steps to run these images as containers. The tutorial also touches on the orchestration of applications using Docker and Kubernetes, highlighting the importance of Dockerfiles and the role of public and private registries.

Explain the role of a container registry in the Docker ecosystem.

What is the significance of writing a Dockerfile for an application?