Site structure refers to how a website organizes its content through grouping, linking, and presenting content to visitors. It is important for providing a smooth user experience and improving search engine crawling. There are different models of website architecture like database, sequential, matrix, and hierarchical. Site structure should be considered before designing a website and creating pages to help users and search engines navigate content easily. WordPress allows organizing content through pages, posts, taxonomies, and navigation menus to structure a site. [/SUMMARY]