we need more clean and short post like this Docker is 4 things (clear title) state of the art?/ information needed -First, the Dockerfile file format for decl

we need more clean and short post like this Docker is 4 things (clear title) state of the art?/ information needed -First, the Dockerfile file format for declaratively describing a machine (operating system, installed packages, processes, etc). -Second, the Docker Engine which takes a Dockerfile and runs it on a Linux host natively, without a virtual machine. -Third, the Docker Desktop app which takes a Dockerfile and runs it on a Mac or Windows host, using a Linux virtual machine. -Fourth, the Docker Hub container repository which allows a community to share Dockerfiles for common configurations. problem that could arrive/why this is important Often, when people evaluate Docker or make statments about “Docker,” they’re referring only to the Docker Engine. conclusion But most of the time, this is not a useful view to take. Most of time, the practicality of Docker comes from a combination of all four of these things."