what are spiders in SEO?

spiders means if you search anything into the google .the google sends the spiders out to crawl the web.and the spiders takes notes on your titles.and giving the accurate result
 
Spiders are also known as crawlers, every search engine has its own crawler. The crawler of Google is called GoogleBot. They are responsible for the complete process that includes crawling, indexing of websites, processing and retrieving of results in search engine result pages SERPs.
 
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