A User Interface (UI) is the interface by which a computer user is able to interact with the computer. It describes the way that the user uses input devices such as keyboards and mice, and the way the information is portrayed on screen or on the output device. From : www.simply.com.au/glossary.php Web design is a process of conceptualization, planning, modeling, and execution of electronic media content delivery via Internet in the form of Markup language suitable for interpretation by Web browser and display as Graphical user interface (GUI). The intent of web design is to create a web site -- a collection of electronic files that reside on a web server/servers and present content and interactive features/interfaces to the end user in form of Web pages once requested. From : http://en.wikipedia.org/wiki/Web_design