The stack describes the way the many components are layered in a large system or solution, though it is more common nowadays to think of stacks as particular combinations of components. E.G the LAMP stack stands for Linux, Apache, Mysql, PHP and it is a very popular combination of components on which to develop PHP applications for the web. To some this may sound suspiciously like a technical architecture and this is a shrewd observation because it would indeed be a technical architect who would be likely to make this decision, but in reality, a stack such as lamp would be only one smallish part of an Enterprise’s overall Technical architecture.
The “Explainned series” is planned to build into a trustworthy collection of explanations and commentaries that can be trusted to tell the story straight without any bias and attempt to make the subjects accessible to the layman. The latter is not always easy as some of these terms refer to genuinely complex subject matter, while others are simply too vague to pin down (there’s another word for that).
If you want an answer on something and you can’t find it easily, please use the comments section to just ask and I will apreciate not having to research the next topic.