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en.wikipedia.org/wiki/Search_engine_spider

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, typically for the purpose of Web indexing (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.

www.webcrawler.com

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computer.howstuffworks.com/search-engine-spider.htm

Search engine spiders, sometimes called crawlers, are used by Internet search engines to collect information about Web sites and individual Web pages. The search engines need information from all the sites and pages; otherwise they wouldn’t know what pages to display in response to a search query or with what priority.

www.sphider.eu

Sphider is a lightweight web spider and search engine written in PHP, using MySQL as its back end database. It is a great tool for adding search functionality to your web site or building your custom search engine. Sphider is small, easy to set up and modify, and is used in thousands of websites across the world.

www.techopedia.com/definition/27177/search-engine-spider

A search engine spider is an intangible program, but it is called a spider because of the way it works to order Web results. The spider weaves a web of indexed Web pages by analyzing the HTML and other elements on each page.

www.webopedia.com/TERM/S/spider.html

Spiders are used to feed pages to search engines. It's called a spider because it crawls over the Web. Another term for these programs is webcrawler. Because most Web pages contain links to other pages, a spider can start almost anywhere. As soon as it sees a link to another page, it goes off and fetches it.

whatis.techtarget.com/definition/spider

A spider is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index. The major search engines on the Web all have such a program, which is also known as a "crawler" or a "bot." Spiders are typically programmed to visit sites that have been submitted by their owners as new or updated.

computer.howstuffworks.com/internet/basics/search-engine1.htm

Before a search engine can tell you where a file or document is, it must be found. To find information on the hundreds of millions of Web pages that exist, a search engine employs special software robots, called spiders, to build lists of the words found on Web sites.When a spider is building its lists, the process is called Web crawling. (There are some disadvantages to calling part of the ...

metamend.com/archive/education/search-engine-bots

Search Engine Bots. Search engines are, for the most part, entities that rely on automated software agents called spiders, crawlers, robots and bots. These bots are the seekers of content on the Internet, and from within individual web pages. These tools are key parts in how the search engines operate.

www.lifewire.com/how-does-search-engine-work-3482032

A search engine is a software program that searches for websites based on the words that you designate as search terms. Search engines look through their own databases of information in order to find what it is that you are looking for.