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For every application or microservice that we want to dockerize, we create a Dockerfile.
We can imagine a Dockerfile is a recipe guiding how to build the image.
Using Docker and Dockerfile, we build the image of the app/microservice along with its dependencies.
Now this image can run on same/another machine having docker. We don’t need to install anything manually.
The app/microservice runs seamlessly.
If the image could be viewed as an object, the container could be viewed as the running instance of the image.