What is SEO Spider

SEO Spider is a software that track links throughout the Websites, acquire content from sites and add it to search engine databases for indexing hence, it is also known as site indexing by search engine.

Spider follows and crawl around the website links from one page to another and one site to another (Internal and external links of the web) and acquires content of site to index website because of this reason Link building is really important for website but keeping one thing in mind that the links should be relevant and content should be fresh and your own, as Google had clearly said in public that the number and quality of links to your site will directly impact its rankings in the search results and if the linking is not fair or crawler caught you using Doorway or Clocked pages and using copied content or using any Black Hat SEO it will lead you loss in ranking.

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Reference

www.seologic.com