The open nature of the World Wide Web presents incredible opportunities for people who want to create websites or online applications. To take full advantage of the web's capabilities, you need to know how to use them. Web technologies Basics HTML HyperText Markup Language (HTML) is used to describe and define the content of a webpage. CSS Cascading Style Sheets (CSS) are used to describe the appearance or presentation of content on a webpage. HTTP Hypertext Transfer Protocol (HTTP) is used to deliver HTML and other hypermedia documents on the web. Scripting JavaScript JavaScript is the programming language that runs in your browser. You can use it to add interactivity and other dynamic features to your website or application.