How Search Engine works?
Search Engines contain large amount of data.And this data was spread out in every part of the world on remote web servers.The problem of locating correct page depends up on Search Engine algorithm. Different search engines have different algorithms.For example let us take this keyword “How search engine works“. When you type This keyword (How search engine works) in google it shows total 18,400,000 indexed pages. And in Yahoo it shows total 130,000,000 indexed pages. This website computer.howstuffworks.com takes first place in google for the given keywords ( How search engine works) . but it shifts to shifts to 3 position for the same given keywords in yahoo. From this we can understand different search engines have different algorithms. In order to understand the methods and techniques to position your website pages for higher ranking in search engines, the knowledge of the basic functioning of a search engine is must.

Search engine is a computer software.Every year search engine algorithm changes with improved technologies to provide better search results.All search engines does the same function as collecting data ,organizing, indexing and serving results in their own ways. the functions of search engine can be divided in to following:

* Crawling pages from the internet.
* Organizing and indexing the web pages.
* Storing website content.
* Search engine algorithms and results.

How search engine works?????
When we submit our website link to search engine it crawls data. search engines crawls using bots and spiders. It has to crawl millions of pages so it takes time for indexing our data. The crawler or web spider is a computer software program that can download web content , and then follow hyper-links within these web contents or pages to download the linked contents.

The crawling continues until it finds a logical stop, such as a dead end with no external links or reaching the set number of levels inside the websites link structure. If a website is not linked from other websites on the internet, the crawler will be unable to locate it. Therefore, if the website is new, and has no links from other sites, that website has to be submitted to each of the search engines for crawling.News and media sites are crawled regularly by search engines like google ,yahoo, msn why because they need to update their information in servers and display latest search results.Usually search engines crawl only a few (three or four) levels deep from the homepage of a website. The term deep crawl is used to denote that the crawler or spider can index pages that are many levels deep. Google is an example of a deep crawler.After crawling the pages they gather huge amount of data and store them in their database.This is how search engine works.