| document classifier | Noun phrase. A computer program used to analyze the content, structure, and/or meta data associated with a Web document for the purpose of identifying or flagging or weighting or scoring the document in a search application or system. Sometimes simply referred to as a Classifier. |
| hub | Noun. A document that links out to many other documents devoted to a single topic. Think of any category page in a major directory like Yahoo! or DMOZ. All the documents linked to are assumed to be authorities (sort of a circular logic). In Jon Kleinbergs HITS algorithm (q.v.) (as well as the CLEVER, ExpertRank, and Edison algorithms) a hub is a document about a specific topic that links to many experts in the topic. Cf. Expert. |
| tweet listings | Links from Twitter that are listed within the SERP. |
| schema mark-up | Structured data mark-up designed to show search engines what content means, not just what it says. Special tags are wrapped around content to designate their role, allowing search engines to build a more detailed picture of the page they are looking at. |
| conceptual searching | A technique employed by most search engines, conceptual search is when a search engine interprets a query on a semantic or contextual level rather than just matching words. Conceptual searching results in more relevant search results. |
