Web structures refer to the organization and layout of information on the internet. They help users navigate websites efficiently by using various elements like menus, links, and categories. A well-designed web structure enhances user experience and makes it easier to find relevant content. Common types of web structures include hierarchical, linear, and network models. The hierarchical model resembles a tree, with a main page branching out to subpages. In contrast, the linear model presents information in a straight line, while the network model allows for multiple connections between pages. These structures are essential for effective web design and usability.