Google How Do Search Engines Work ? - Seo Sandwitch Blog

Monday, May 21, 2012

How Do Search Engines Work ?


Search Engines uses a complex algorithm to rank web pages. This algorithm considers various signals from a variety of sources for accurate ranking of web pages with respect to the search queries entered by the user. Major search engines like Google, Yahoo, Bing, Baidu, Excite, Ask, Yandex etc maintain a huge database for the storage of billions of web pages which are crawled by their bots every day. It is because of this combination of database and algorithms that we are able to find information easily on the web. Search engines make use of specialized data centers and larger memories to process large chunks of data and display the search results within seconds. 

Here is the step by step tutorial on how the search engines work ?

Step 1

Search Engine bots (spiders) crawl the web searching for hyperlinks on a web page. The links crawled are stored in a large data base which may be divided into specific data centers according to the geographic localization. In this way, search engines continue this process of crawling and indexing of data.

Step 2

The large chunks of data stored in the database are processed with the help of high quality processors. These processors are efficient enough to process billions of web pages and fetch out accurate data with respect to the search query entered by the user.

Step 3

Now when a user enters a search query, the search engine matches the query with the available web pages in its database. This searching is done extremely fast with the help of latest processors. Searching of the data is done on the basis of an algorithm which is kept a secret.

Step 4
After the data is processed the search engines return links to web pages which are closely related to the user’s query.

Important Terms related to Search Engines
Crawler/Robot- These are specialized software which continuously roam the web and crawl the new hyperlinks which are available.
Indexing- Storing the data according to a specific data structure which helps in improving the speed of data retrieval.
Hyperlinks- A Link to another data or resource from the current document. A user browses the web with the help of hyperlinks.
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