Containerization is emerging as the way forward for the software industry as it brings forth a newer and richer way of building and bundling any kind of software, shipping and running them everywhere. That is the fast-evolving aspect of containerization that promises and provides software portability, which has been a constant nuisance for IT developers and administrators for many decades now. The Docker idea is flourishing here because of a number of enabling factors and facets. This section is specially prepared for specifying the key use cases of the Docker idea.