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2024-04-21T13:48:49Z

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[[File:A_screenshot_of_suggestions_by_Google_Search_when_"wikip"_is_typed.png|A screenshot of suggestions by Google Search when "wikip" is typed|thumb]] [[File:WebCrawlerArchitecture.svg|WebCrawlerArchitecture|thumb|left]] '''Search engine''' is a software system designed to carry out [[web search]] (Internet search), which means to search the [[World Wide Web]] in a systematic way for particular information specified in a textual web search query. The search results are generally presented in a line of results, often referred to as search engine results pages (SERPs). The information may be a mix of [[web pages]], [[images]], [[videos]], and other types of files. Some search engines also mine data available in databases or open directories. Unlike web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.

==History==
The concept of retrieving information through the use of linked documents is a fundamental idea that led to the creation of the first search engines. In the early 1990s, [[W3Catalog]], [[Aliweb]], and [[JumpStation]] were some of the first attempts to index the web, leading to more sophisticated systems like [[Yahoo!]], [[Lycos]], and [[Infoseek]]. The launch of [[Google]] in 1998 revolutionized the search engine market by introducing an algorithm based on page relevance and backlinks, which has since become a fundamental aspect of search technology.

==How Search Engines Work==
Search engines operate by crawling billions of pages using their own web crawlers. These web crawlers are often referred to as search engine bots or spiders. A search engine navigates the web by downloading web pages and following links on these pages to discover new pages that have been made available.

The contents of each page are then analyzed to determine how it should be indexed (for example, words are extracted from the titles, headings, or special fields called meta tags). Data about web pages are stored in an index database for use in later queries. A query from a user can be a single word. The index helps find information relating to the query as quickly as possible.

Some of the algorithms that search engines use to determine the order of search results include terms frequency, site authority, and the age of the content, among others. Over time, search engines have adopted more complex algorithms to refine search results and improve user experience.

==Types of Search Engines==
There are several types of search engines, designed to address different needs. These include:

- '''Web Search Engines''' (e.g., [[Google]], [[Bing]], [[Yahoo!]])
- '''Vertical Search Engines''' that specialize in specific types of content, like [[Google Scholar]] for academic papers or [[YouTube]] for videos.
- '''Meta Search Engines''' that aggregate results from multiple search engines (e.g., [[Dogpile]], [[Metacrawler]]).

==Privacy Concerns==
With the rise of search engines, privacy concerns have also escalated. Search engines have the capability to track a user's searches, which can be a breach of privacy. In response, some search engines, like [[DuckDuckGo]], have focused on providing privacy-preserving search experiences.

==Future of Search Engines==
The future of search engines lies in becoming more intelligent and personalized. Advances in [[artificial intelligence]] and [[machine learning]] are making it possible for search engines to understand the context of queries, predict user intent, and deliver more relevant results. Voice search and visual search are also becoming more prevalent, further expanding the capabilities of search engines.

[[Category:Internet search engines]]
[[Category:World Wide Web]]
[[Category:Information retrieval]]

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Search engine - Revision history

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