Developer develops and packages application with its dependencies

into a container image, that is a static representation of the application with its configuration and dependencies.

▪ To run the application, the application’s image is instantiated to create a container, which will be running on the Docker host.

▪ Store images in a registry, which is a library of images and is needed when deploying to production orchestrators.

▪ Docker images are stores a public registry like Docker Hub, Azure Container Registry.

▪ Developer creates container in local and push the images the Docker Registry.

▪ Developer download existing image from registry and create container from image in local environment.

https://learn.microsoft.com/en-us/dotnet/architecture/microservices/container-docker-introduction/docker-containers-images-registries