To most people, markup means an increase in the price of an article. Here, “markup” is a term from the publishing and printing business, where it means the instructions for the typesetter, written on a typescript or manuscript copy by an editor. Typesetting systems like (LA)TEX have these commands embedded in the electronic source. A markup language is a set of means (constructs) to express how text (i.e., that which is not markup) should be processed, or handled in other ways.