You type anything in Google search and it instantly present results in-front you. You must be wondering how google search for you. How does Google find web pages matching your query, and determine the order of search results?

Learn How google search

In the simplest way, to understand working of google you can think of searching the web as looking in a very large book with an impressive index telling you exactly where everything is located. When you perform a Google search, google programs check our index to determine the most relevant search results to be returned.

It basically perform three task to provide you all relevant search.
Crawling
Indexing
Serving results

Crawaling

Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index.
Google or any other search engine use huge set of computers to fetch (or “crawl”) billions of pages on the web. The program that does the fetching is called Googlebot (also known as a robot, bot, or spider). Googlebot uses an algorithmic process: computer programs determine which sites to crawl, how often, and how many pages to fetch from each site.
google bot visit to your site oftentimes and note down all new url with help of site map submitted by you also add all url link on any page. It also not all dead urls.

Indexing

Googlebot processes each of the pages it crawls in order to compile a massive index of all the words it sees and their location on each page. In addition, we process information included in key content tags and attributes, such as Title tags and ALT attributes.

Serving results

When we enter any query, it returns all relevant results to the query based on page rank.Relevancy is determined by over 200 factors and then given a rank.

Google is putting lots of efforts so relevant results served to us.

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He is founder and CTO of Habilelabs.io. He senior software architect. He is guru of various Mobile and web technologies including Node.js, Angular.js, Meteor.js. He is founder member of habilelabs Pvt. Ltd.