Publisher Summary This chapter provides an insight into core design principles and guidelines for the creation of Web site and detailed tips and examples on how to apply these principles and guidelines. The good design of a Web site is essential for its success, as user only needs to select the back button on the browser to leave the site. Thus a designer should create a site that is usable and useful, providing content and functionality that are of value to the users. Content is a critical component of a Web site. If the developer does not provide the information or functionality that the target users want, they may never visit the site again. Most sites need to be updated regularly. The frequency of the update will vary according to the nature of the site Users need to be able to find the information or services they need quickly and easily. The site must allow the users to carry out the tasks they want to perform.