HTML is a markup language. The word markup was used by editors who marked up manuscripts (usually with a blue pencil) when giving instructions for revisions. "Markup" now means something slightly different: a language with specific syntax that instructs a Web browser how to display a page. Once again, HTML separates "content" (words, images, audio, video, and so on) from "presentation" (instructions for displaying each type of content). HTML uses a pre-defined set of elements to define content types. Elements contain one or more "tags" that contain or express content. Tags are enclosed by angle brackets, and the closing tag begins with a forward slash.
- CSS stands for Cascading Style Sheets
- CSS describes how HTML elements are to be displayed on screen, paper, or in other media
- CSS saves a lot of work. It can control the layout of multiple web pages all at once
- External stylesheets are stored in CSS files