If someone doesn't understand "container", I'm supposed to expect them to understand all the namespaces and their uses, cgroups, and the nitty gritty of the wimpy security isolation? You are proving my point that it's tough to summarize by using a bunch more terms that are difficult to summarize.

Once you recursively expand all the concepts, you will have multiple dense paragraphs, which don't "summarize" anything, but instead provide full explanations.