HTML stands for H yper T ext M arkup L anguage. HTML, by virtue of its SGML heritage, is a standardized language for describing structured documents .
Most documents have common elements, such as, titles, paragraphs, and lists.
These elements are identified in HTML through the use of tags . Everything that is not a HTML tag is part of the document content. With a few exceptions, HTML does not allow you to describe the exact appearance or layout of a document. The designers of HTML did this on purpose. Because you don't know the capabilities of the computer that is going to display the document, i.e. the size of the screen, the fonts that are installed, etc.