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 .
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Web crawler is known as a spider, an ant, an automatic indexer, or a Web scutter.
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One of the conclusions was that if the Web crawler wants to download pages with high Pagerank early during the crawling process, then the partial Pagerank strategy is the better, followed by breadth-first and backlink-count.
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Cothey found that a path-ascending Web crawler was very effective in finding isolated resources, or resources for which no inbound link would have been found in regular crawling.
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Importance of a page for a Web crawler can be expressed as a function of the similarity of a page to a given query.
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Web crawler has a very dynamic nature, and crawling a fraction of the Web crawler can take weeks or months.
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Objective of the Web crawler is to keep the average freshness of pages in its collection as high as possible, or to keep the average age of pages as low as possible.
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The MercatorWeb crawler follows an adaptive politeness policy: if it took t seconds to download a document from a given server, the crawler waits for 10t seconds before downloading the next page.
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Parallel Web crawler is a Web crawler that runs multiple processes in parallel.
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When Web crawler designs are published, there is often an important lack of detail that prevents others from reproducing the work.
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In some cases, such as the Googlebot, Web crawler crawling is done on all text contained inside the hypertext content, tags, or text.
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One of the main difference between a classic and a visual Web crawler is the level of programming ability required to set up a Web crawler.
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The dominant method for teaching a visual Web crawler is by highlighting data in a browser and training columns and rows.
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