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Search engine indexing is the collecting, parsing, and storing of data to facilitate fast and accurate information retrieval.Index design incorporates interdisciplinary concepts from linguistics, cognitive psychology, mathematics, informatics, and computer science.
Web indexing, or Internet indexing, comprises methods for indexing the contents of a website or of the Internet as a whole. Individual websites or intranets may use a back-of-the-book index, while search engines usually use keywords and metadata to provide a more useful vocabulary for Internet or onsite searching.
The Surface Web (also called the Visible Web, Indexed Web, Indexable Web or Lightnet) [1] is the portion of the World Wide Web that is readily available to the general public and searchable with standard web search engines. It is the opposite of the deep web, the part of the web not indexed by a web search engine. [2]
Types of URI normalization. URI normalization is the process by which URIs are modified and standardized in a consistent manner. The goal of the normalization process is to transform a URI into a normalized URI so it is possible to determine if two syntactically different URIs may be equivalent.
The deep web, [1] invisible web, [2] or hidden web [3] are parts of the World Wide Web whose contents are not indexed by standard web search-engine programs. [4] This is in contrast to the "surface web", which is accessible to anyone using the Internet. [5]
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A search engine lists web pages on the Internet.This facilitates research by offering an immediate variety of applicable options. Possibly useful items on the results list include the source material or the electronic tools that a web site can provide, such as a dictionary, but the list itself, as a whole, can also indicate important information.
The crawler was integrated with the indexing process, because text parsing was done for full-text indexing and also for URL extraction. There is a URL server that sends lists of URLs to be fetched by several crawling processes. During parsing, the URLs found were passed to a URL server that checked if the URL have been previously seen.