5 Main Functions of Web Crawlers, Spiders and Bots
What are Bots, Spiders and Crawlers?
Ever wonder what serves you page results on Google search engine result pages (SERPs). Not only are these pages well organised, they are also arranged in order of importance. As a user, it is a bad user experience to search on Google and the results you get are irrelevant, trust me it can be annoying.
Well its time to meet the Web Crawlers, Spiders or Bots
These Web crawlers are set of programs or instructions written to crawl and index your website. Although they do more than index and crawling, they check links that are pointing to your websites too.
Process of creating index for all the fetched web pages and keeping them into a giant database from where it can later be retrieved. Essentially, the process of indexing is identifying the words and expressions that best describe the page and assigning the page to particular keywords.
It is likely that more than one page contains the search string, so the search engine starts calculating the relevancy of each of the pages in its index to the search string. The relevancy most times depends on PageRank, Domain Authority, Page Authority, Social Shares and other factors.
There are ways these crawlers can be controlled when accessing your site. One good example is using the Meta Robots Tags. Also you can use the Robots.txt file to control them.