Web navigation refers to the process of navigating a network of information resources in the World Wide Web, which is organized as a hypertext or hypermedia. The user interface that is used to do so is called a web browser. A central theme in web design is the development of a web navigation interface that maximizes usability. A website's overall navigational scheme includes several navigational pieces such as global, local, supplemental, and contextual navigation, all of these are vital aspects of the broad topic of web navigation. The global navigation of a website, for instance, serves as the outline and template in order to achieve an easy maneuver for the users accessing the site, while local navigation is often used to help the users within a specific section of the site.