For search engines that crawl the web, links are the streets between pages. Using link analysis, the engines can discover how pages are related to other pages and in what ways. Since the late 1990's links have also served as a stand-in for votes - representing the democracy of the web's opinion about what pages are important and popular.

XML site map is a list of pages of a web site accessible to crawlers or users. It can be either a document in any form used as a planning tool for web design, or a web page that lists the pages on a web site, typically organized in hierarchical fashion. This helps visitors and search engine bots find pages on the site.

Social bookmarking is a method for Internet users to organize, store, manage and search for bookmarks of resources online. Many online bookmark management services have launched since 1996; Delicious, founded in 2003, popularized the terms "social bookmarking" and "tagging". Tagging is a significant feature of social bookmarking systems, enabling users to organize their bookmarks in flexible ways and develop shared vocabularies known as folksonom

An article is a word that combines with a noun to indicate the type of reference being made by the noun. Articles specify the grammatical definiteness of the noun, in some languages extending to volume or numerical scope. The articles in the English language are the and a/an, and (in some contexts) some.