This document discusses web development. It begins by defining a website as a set of related web pages with a common domain or IP address that are organized hierarchically and contain hyperlinks. It then explains that web applications are accessed through browsers and run on web servers, and can be either service-oriented or presentation-oriented. The document outlines the web development process, including information gathering, planning, design, development, testing, and maintenance. It describes front-end development as client-side work using HTML, CSS, and JavaScript to produce interactive content. HTML encodes documents, CSS improves appearance, and JavaScript enables interactivity.