Google Search Engine Working - Quesnair

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Google Search Engine Working

Google Search work on the Algorithm. They have bots AKA Crawlers, Spiders. Working of this spiders are complicated.
Over the period the google has become smarter. In Early days of Pagerank to latest Rankbrain the different algorithm update makes google smarter.
But the basic structure for working is same. I try to summarize working in three important steps.
  1. Crawling
  2. Indexing
  3. Serving Result
Lets take a brief of each steps
1). Crawling:
Process of fetching all the web pages linked to a website is crawling. they are basically used to extract the relevant searched information from the various websites automatically based on different criterion
Crawlers look at web pages and follow links on those pages, much like you would if you were browsing content on the web. They go from link to link and bring data about those webpages back to Google’s servers.
When Crawler visit the webpage they take a photo/Copy of the page called as snapshot.
There is one more concept called Cache Date When Crawling comes on the page they leave a date and time on the page. When they last visited
2) 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.
Snapshot taken by the crawler is saved into their database. Which is used to show the page result on the SERP.
If the you have updated the page and Indexing is not done then google will show old version on search result.
3) Serving Result:
First two step is the same for all the search engine. But while serving result google is better than other search engines.
So now google has database of billions of pages on internet. Each page is talking about different queries (As the SEO worlds knows Keywords).
Algorithm has to decide the which page to rank first, second, third and so on. For that google will consider more than 200 factors and serve the result to user.
All this process is to give the most relevant result to the user. So that the user query will be solved.

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