Short for markup language. The original English definition of markup is "the process or result of correcting text in preparation for printing." The SEO definition of markup language is "a system for annotating [providing extra information about the pieces of] a document, that is not part of the visual display" of the document. For example: "HTML" is the "HyperText Markup Language" used to create and display web pages that link to each other.
Celebrating 25 Years of Creating an Island of Stability In the Sea of Online Confusion
