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Search Engine Spider Simulator is a SEO Tool Web Masters can use to simulate a search engine by displaying the contents of a web page exactly the way the search engine bot would see it prior to crawling it. It also displays the hyperlinks that will be followed (crawled) by a Search Engine when it visits a particular webpage.
A Web crawler, sometimes called a spider, is an Internet bot that systematically browses the World Wide Web, typically for the purpose of Web indexing (also called web spidering).
Web search engines and some other sites use Web crawling or spidering software to update their web content or indices of others sites' web content. Web crawlers copy pages for processing by a search engine which indexes the downloaded pages so users can search more efficiently.
Crawlers consume resources on visited systems and often visit sites without approval.
Issues of schedule, load, and "politeness" come into play when large collections of pages are accessed. Mechanisms exist for public sites not wishing to be crawled to make this known to the crawling agent. For instance, including a robots.txt file can request bots to index only parts of a website, or nothing at all.