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How Do Search Engines (SEO) Work - Web Crawlers

 How Do Search Engines Work - Web Crawlers


It is the search engines that finally bring your website to the notice of the prospective customers. Hence  it's  better to know how these search engines actually work and how they present information to the customer initiating a search.    


There are basically two  sorts of  search engines.  the primary  is by robots called crawlers or spiders. 


Search Engines use spiders to index websites.  once you  submit your website pages to a search engine by completing their required submission page, the  program  spider will index your entire site. A ‘spider’ is  an automatic  program that is run by the search engine system. Spider visits  an internet  site, read the content on  the particular  site,  the location 's Meta tags and also follow the links that the site connects. The spider then returns all that information back to a central depository, where  the info  is indexed.  it'll  visit each link you have on your website and index those sites as well. Some spiders will only index  a specific  number of pages on your site, so don’t create a site with 500 pages!


The spider will periodically return to the sites  to test  for any information that has changed. The frequency with which this happens  is decided  by the moderators of the search engine.




A spider  is nearly  like a book where it contains the table of contents,  the particular  content and the links and references for all the websites it finds during its search, and  it's going to  index up to a million pages a day.


Example:  Excite, Lycos, AltaVista and Google.


When you ask a search engine to locate information,  it's  actually searching through the index which it has created and not actually searching the Web. Different  program s produce different rankings because not every search engine uses the same algorithm to search through the indices. 


One of the things that a search engine algorithm scans for is the frequency and location of keywords on a web page, but it  also can  detect artificial keyword stuffing or spamdexing. Then the algorithms analyze the way that pages link to other pages  within the  Web. By checking how pages link  to every  other, an engine can both determine what a page is about, if the keywords of the linked pages are  almost like  the keywords on the original page.

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