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What is the main usage of search engine spiders?

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.

Search engine spiders, sometimes called crawlers, are used by Internet search engines to collect information about Web sites and individual Web pages. ... The spider then gathers additional information by following the hyperlinks on the Web page, which gives it a better collection of data about those pages.

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.

Spider is a program of google that crawl the website. It is also called google crawler. When a website has completed then the google spider checks the total website to rank.