Search engines perform several activities in order to deliver search results.
 Crawling – Process of fetching all the web pages linked to a
website. This task is performed by a software, called
acrawler or aspider (or Googlebot, in case of Google).
 Indexing – 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.
 Processing – When a search request comes, the search engine
processes it, i.e. it compares the search string in the search
request with the indexed pages in the database.
 Calculating Relevancy – 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.
 Retrieving Results – The last step in search engine activities is
retrieving the best matched results. Basically, it is nothing more
than simply displaying them in the browser.
Search engines such as Google and Yahoo! often update their relevancy
algorithm dozens of times per month. When you see changes in your
rankings it is due to an algorithmic shift or something else outside of your
Although the basic principle of operation of all search engines is the same,
the minor differences between their relevancy algorithms lead to major
changes in results relevancy.


  1. kalyanitangadpally says:

    Digital marketing notes

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