Subject catalogue similar to library classification. For example, Sohu classified catalogue is divided into 18 categories according to the theme, and further subdivided into secondary and tertiary subcategories.
The classified catalogue is an online guide to find information on the Internet. The editor of classified catalogue organizes all Chinese website resources and puts them into corresponding catalogues according to different themes, thus forming a website classified catalogue system.
Book classification, coding, retrieval and marking catalogue system. These cards are arranged in the order of classification numbers. The classified catalogue reveals the collection of books in the library from the knowledge system. China book classification mainly includes China Library Classification (CLC), China Academy of Sciences Library Classification (Kotu Law) and Renmin University of China Library Classification (NPC Law), while western book classification mainly includes Dewey Decimal Classification (Dewey Law) and Library of Congress Book Classification. International book integrated classification. If researchers want to find what they need as soon as possible, they must be familiar with book classification. Website classification directory refers to the manual or systematic separation of all websites into corresponding directories.
Classified catalogue refers to the system of website classified catalogue, which is formed by manually collecting website resources, sorting out their themes and storing them in corresponding catalogues.
Search engines attach great importance to external links such as high-quality classified directories, and must pay attention to them when conducting SEO. However, for low-quality classified catalogs, search engines not only ignore them, but even include them in the scope of linked catalogs. Once they are considered as linked farms, both the directory link itself and the target page of the link will be more dangerous. A link farm is a low-quality website or page that stores a large number of low-quality links.
Classify the directory and make it our external link, then our website will gain higher weight in the corresponding search engine. For example, Baidu pays more attention to hao 123, tm3 12, Google pays more attention to ODP, and Yahoo pays more attention to its own Yahoo directory, which has the characteristics of one-way and high quality. Hundreds of thousands of navigation websites in China are inexhaustible resources. Classification and search are tools for users to find website information. The difference lies in the different ways to find information. Classified catalogue is to put the information of the same theme website together and arrange it in a certain order, and search it layer by layer through the theme catalogue, such as Sohu's classified catalogue; Search means that users can directly query with keywords without going through the directory to find out all the website information corresponding to a keyword (and arrange it according to its relevance), such as Baidu search. In addition, the classified catalogue has a tree structure that can be browsed, and you can click on the topic layer by layer. For example, if you want to find information about the game Paradise, you can go to the classified catalogue Entertainment & Leisure. Games > online games > multiplayer online games > paradise "to find some website information about paradise; You can also enter the keyword "heaven" directly in the search box without going through the directory, and click search to get all the website information about heaven.
The results of these two search methods are different: more than 100 pieces of website information obtained through directory search are recommended to everyone after editing and verification, and the information is small but very accurate; The search results are all the website information related to "Paradise" on the Internet (but not necessarily the game "Paradise", such as Paradise Hotel, etc. ), with a large amount of information but poor correlation.