Every day more than 415 billion searches occur on Google. What happens behind a search engine when looking for something on the net? These three components will help you understand it better.
When a person uses a search engine to resolve a concern, either on Google, Yahoo! or Bing – to name the most popular – hundreds of millions of virtual interactions occur internally to find a response in seconds.
These are the three basic functions that define the operation:
The crawlers or web spiders are software robots that handle trace files and browse hundreds of billions of pages found on the Web. Usually this is determined by tracking the keywords that make the searches of search engine users, a factor that varies second by second: according to Moz, only 30% of searches performed on search engines like Google, Bing or Yahoo! corresponds a generic words and phrases. The remaining 70% are usually random.
After the screening process, search engines decoded, sorted and stored each of the files found in different ‘virtual warehouse’, which are sorted according to key words and phrases that define them, so that when a person perform a search engine can instantly find the information corresponding to it.
Once the information indexed, the search is responsible for evaluating the content, structure and other factors – publication date, number and duration of visits, number of backlinks (links to external reference), origin of those backlinks, among others – each of the stored files to determine its relevance. According to this assessment the search engine gives it an order of importance to each of the files found, so that when a user performs a search to find the best results ever.