Friday, 23 May 2014

How search engine operates?

Search engine has four functions- crawling, building an index, calculating relevancy and ranking and then it serves the results to user.

1. Crawling and Indexing

Crawling and indexing the billions of
documents, pages, files, news,
videos and media on the world wide

2. Providing Answers

Providing answers to user queries,
most frequently through lists of
relevant pages through retrieval and

Search engines like google firstly crawl the site (basically it reads first 100 words) , If google finds that the site is good for user (quality content) then It index the site and then It checks for the relevancy of the site content and then place it in a particular rank according to the popularity of the site. After that It provides the search result page in particular format. For e.g you search for cars in google search engine, then google will provide SERP (Search Engine Result Page) in which it will provide the websites related to cars in proper rank order. It means the website placed on first number has large priority than others in terms of google. Also you will find some paid ads on google top and side bar, we will discuss them later.

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