A collection of analogies for how Docker / containerization fits into the broader tech stack. Part of understanding these analogies is knowing that an operating system, at the end of the day, is really a program itself (albeit one that mediates access to the underlying hardware for other programs).
Docker/Kata/CRI-O Container : Python Virtual Environment, where a container is an environment for operating system libraries and other components written in C. Essentially, a container is a virtual environment for C code / lower-level code.
A Docker Image / Golden image : Application binary
Dockerfile / Ansible / Config management : Application source code
Packer / Buildah / Image Builder: Make
Dockerhub / container image registry : Yum repository