Part 1: How does Google Search Engine work?

It’s almost impossible to imagine life without Google. We all use Google search engine to find information and answers. We open Google and type our search query and Google gives us links of websites from where we can find information we were searching.

So, what happens behind the scene? How Google get’s all this information, how Google gives such relevant answer, how Google is able to provide result so fast?

Have you ever thought how does Google search engine work?

It’s next to impossible to understand how exactly Google search works. It’s secret which Google will never tell anyone. (Yes, I am going to share this with you in this article)

Well, you can find some information about how Google search works on internet, but this article will provide you all you wanted to know about how Google search works in one place.

You can also Download PDF version which you can read offline. 

Let’s first understand What is Google search engine.

Google is not just search engine now. Google was started as search engine and today Google is well know brand and a big technology company. How Google became so popular is beyond the scope of this article.

Google’s search engine is a powerful software which is being updated periodically to maintain quality of results delivered by Google.

What is Search Engine?

Search engine is a tool or software which allows you to find specific website or webpage on internet. There are billions of websites on internet having trillions of pages written on various topics. Search Engines help you find relevant information from various websites.

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Search engines like Google uses complex software which is known as “search algorithm” to sort and filter pages based on multiple ranking factors. This ranking algorithm is the core of any search engine. If your algorithm is not powerful, your results may not be accurate, may not be relevant and  you will start losing market share.

If you talk specifically about Google, Google uses more than 200 ranking factors to rank pages in search result. 

Now let’s try to understand how does Google work?

Google uses complex algorithms to analyse more than 60 trillion web pages stored in their database. This database is know as search index. As I mentioned above, Google considers more than 200 factors to sort and filer pages and assigns rank to those pages before those pages are displayed in search results.

Here is one thing to Remember: Google keeps updating technologies, systems, search algorithms to deliver better results. 

4 steps process used by Google search engine

Step #1 Crawl – Collect information from website

Step #2 Index – Put collected information into database

Step #3 Calculate Relevancy – Use search algorithm to sort and filer results

Step #4 Display Results -Display results as per search query

How does Google search engine works

How search engines work (Simplified version)

Here is complete process in detail

There are three main parts of Google Search Engine. One is Crawling and Indexing, then comes Google Search Algorithm and then comes results display.

What is Crawling and how Google crawling works?

Crawling means following all links of webpage to fetch information from webpages using special software known as ‘crawler’, ‘bot’ or ‘spider’.

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Software used by Google to crawl pages is known as ‘Googlebot’. This is powerful web crawler software developed by Google to fetch important information from webpages. Googlebot collects information like domain name, URL, title of page, meta description, meta keywords and meta tags, text, links to images, video and audio content also.

Tip: You can restrict access to certain pages (URL’s) using ROBOTS.TXT file

Actually Google uses multiple crawlers to find different types of information.

Crawler User agent token
Googlebot (Google Web search) Googlebot
Googlebot News Googlebot-News
(Googlebot)
Googlebot Images Googlebot-Image
(Googlebot)
Googlebot Video Googlebot-Video
(Googlebot)
Google Smartphone Googlebot
Google Mobile AdSense Mediapartners-Google

or

Mediapartners
(Googlebot)

Google AdSense Mediapartners-Google
Mediapartners
(Googlebot)
Google AdsBot landing page quality check AdsBot-Google
Google app crawler

(Used to fetch resources for mobile apps, obeys AdsBot-Google robots rules.)

AdsBot-Google-Mobile-Apps

What is Google Indexing?

What is Indexing, How does Google Index work, how pages are ranked in Google index, how can I get my pages indexed etc.

  1. 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.
  2. 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.
  3. 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.
  4. Retrieving Results and displaying results on computer or mobile screen – 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.
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This article is yet to be completed. Next part I will cover Technology used by Google

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