Whats Markup Language and Why Should I Care?
XML, HTML, and SGML are all markup languages, and markup languages are conceptually different from other output formats you might consider. The markup capability of these languages defines the power of the output format, but is also a major contributor to its cost. Markup is the set of explicit tagging elements that describe something about the information or the text, but it’s not the information or the text itself. For example, you are using markup when you indicate in a word processing document that a section of text should be bolded or italicized. The instruction to bold or to italicize is the markup, as distinguished from the text. This is a direct form of markup and is the easiest to use. You merely use some keystrokes to indicate to the computer that you want something in the document to look bold, and some codes are hidden in the document to tell the computer for future reference how to display the information, and in modern word processors – what you see is what you get. But w
