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Posted by on Oct 25, 2016 in Computers | 0 comments

How do search engines work?

 

How do search engines work

The Internet is a kind of revolutionary invention of this age. There are many tasks we can perform using the internet. The Internet is useful in not only one sector of our life. We can use it in a productive way in education, e-commerce, online shopping, online earning, business and much more. For using the internet, we need a search engine that plays a role of the medium between user and internet. Through search engines, we get enabled to connect to the web and to perform our tasks. The questions which comes in mind are:

What are search engines?

Search engines are essential for getting information through the internet. Besides all this, they also enable us to access any site for any purpose. Search engines as the name implies are the helping agents for searching of any content or any information we need at any time.

How do search engines work?

There are three primary stages of search engines; these are as follows:

  • Crawling
  • Indexing
  • Retrieval

Crawling where the content discovered, Indexing is where the data is analyzed and stored in massive databases, Retrieval where a user query fetches relevant pages.

What is crawling?

Crawling is the initial step a search engine performs first. It is the stage of acquisition of data for any website. It involves scanning of the site and getting the complete list of everyone there, the content, images, keywords it contains and pages it link too. Modern crawlers may cache a copy of the whole page, as well as the also, look for some additional features and information like page layout where the link of the page are? Where the advertising units are?

What is Indexing?

Indexing is the second stage of search engines after crawling of content or the site. It the process of taking all the data you get from crawling and then to place it in a massive database. You can take it as imagine making the list of all the book you own and their author’s name and the number of pages. Going through all the books is known as crawling while making a list of them is known as indexing. There is a huge room or libraries of all over the world filled with books, Google crawl data for your required information in such huge database.

What are Retrieval and ranking?

The third and last but not least step performed by search engines is retrieval and ranking. When you type in a search query and the search engine gives you the most relevant and related documents results in return to you in the display, it is the most complicated process. It is also a process in which search engines differentiate themselves. Some search engines work with keywords; some ask questions while some search engines include advanced features of like keyword proximity or filtering of content by age. The ranking algorithm checks you query against billions of pages that which one is more relevant and nearer to your query. The operation of classification is complicated as most of the companies carefully guard their ranking algorithms as patented industry secrets.

Here we comes to know, how a search engine response our queries and gives us the results which are more relevant and closer to our query. Search engines provide us the best reliable results for our queries we need.

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