Markup language - Wikipedia
https://en.wikipedia.org/wiki/Markup_languageIn computer text processing, a markup language is a system for annotating a document in a way that is visually distinguishable from the content. It is used only to format the text, so that when the document is processed for display, the markup language does not appear. The idea and terminology evolved from the "marking up" of paper manuscripts(i.e., the revision instructions by editors), whi…