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The Yahoo! Directory was a web directory which at one time rivaled DMOZ in size. The directory was Yahoo!'s first offering and started in 1994 under the name Jerry and David's Guide to the World Wide Web. [1] When Yahoo! changed its main results to crawler-based listings under Yahoo!
A Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering).
Yahoo! buys Inktomi (2002) and then Overture Services Inc. (2003) which has already bought AlltheWeb and Altavista. Starting 2003, Yahoo! starts using its own Yahoo Slurp web crawler to power Yahoo! Search. Yahoo! Search combines the technologies of all Yahoo!'s acquisitions (until 2002, Yahoo! had been using Google to power its search). 2004–05
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They can either submit one web page at a time, or they can submit the entire site using a sitemap, but it is normally only necessary to submit the home page of a web site as search engines are able to crawl a well designed website. There are two remaining reasons to submit a web site or web page to a search engine: to add an entirely new web ...
Distributed web crawling is a distributed computing technique whereby Internet search engines employ many computers to index the Internet via web crawling.Such systems may allow for users to voluntarily offer their own computing and bandwidth resources towards crawling web pages.
These search engines function as digital indexes, organizing available content by topic and sub-topic, much like an index in a book. Each search engine builds its index using distinct methods, typically beginning with an automated program called a spider or crawler.
Dogpile is a metasearch engine for information on the World Wide Web that fetches results from Google, Yahoo!, Yandex, Bing, [2] [3] and other popular search engines, including those from audio and video content providers such as Yahoo!. [3]