How Search Engine Works ??

What is Search Engine ??

A web search engine is a software system that is designed to search that is designed to search for information on the World Wide Web. The search result are generally presented in a line of results often referred to as search engine resulting pages (SERPs).

The information may be a specialist in web pages, images, information and other types of files. Some search engines also mine data available in databases or open directories. Unlike web directories, which are maintained only by human editors, search engines also maintain real-time information by running an algorithm on a web crawler.

Search Engine Lists

Some popular Search Engines

Google, Bing, Yahoo, Aol Search, wow

How Search Engine Works?

Search Engine perform several activities in order to deliver search results.

By Matt cutts (Head of Google's Web Spam Team) his Blog.

• Crawling

It is the process of fetching all the webpages linked to the website. This task is performed by software, called a crawler or spider (or Google bot, as is the case with Google).

Google Crawling

• Indexing

It is the process of creating index for all the fetched web pages and keeping them into a giant database from where it can be later be retrieved. Essentially, the process of indexing is identifying the words and expressions that best describe the page and assigning the page to particular keywords.

Google Indexing

• Processing

When a search request comes, the search engine processes it. That is, it compares the search string in the search request with in indexed pages in the database.

• Calculating Relevancy

Since it is likely that more than one page contains the search string, so the search engine starts calculating the relevancy of each of the pages in its index to the search string.

• Retrieving Results

The last step in search engine's activities is retrieving the best matched results. Basically, it is nothing more than simply displaying them in the browser. 

Searching for "todays seo-updation" in Google search engine Displaying most relevant results.

Search Engine Rank

when you search any keywords using a search engine then it displays thousands of results found in its database. A page ranking is measured by the position of the web pages displayed in the search engine results.

If search engine is putting your web page on first position then your web page rank will be number 1 and it will be assumed as with a high rank. SEO is the process of designing and developing a web site to attend a high rank in search engine results.

How Search works according to Google ??