19 March 2012

Search Engine Optimization

What is Search Engine Optimization?
Estimated time to read this post is 2:58 minutes
It is very important term for  blog or web site owner, because without this term your web site or blog have zero value, means if you want to show your blog or website top in the search engine it is very important term.
Whenever you enter your  query in a search engine and hit 'enter' you get a list of web results that contain your query terms. Users normally visits the websites that appeare on the first page that are more relevant to the query. Think why some of these websites rank better than the others on the next pages then you must know that it is because of a powerful web marketing technique called Search Engine Optimization (SEO).

Search Engine Optimization(SEO) is a technique which helps search engines to find and rank your site higher than the  millions of other sites in response to a search query. SEO thus helps you get traffic from search engines.

How Search Engines Work?
The main thing you have know about search engines is that search engines are not human
The first basic truth you need to know to learn SEO is that search engines are not humans. Unlike humans, search engines are text-driven. Search engines crawl the Web, looking at particular site items (mainly text) to get an idea what a site is about. Search engines perform several operations to deliver search results – crawling, indexing, processing, calculating relevancy, and retrieving.

First, search engines crawl the Web to see what is there. This task is performed by a software, called a crawler or a spider (Googlebot, in Google). Spiders follow links from one page to another and index everything they find on their way. Due to the number of pages on the Web (over 30 billion), it is not possible for a spider to visit a site daily to see that a new page has been added or modify existing page, sometimes crawlers  not visit your site for 4/5 weeks.
If you want to see what crawler see on your web site, containing images, Flash movies, JavaScript, frames, password-protected pages and directories, so on, run Spider Stimulator below if above content viewable by the spider. If they will not be spidered, not indexed, not processed, etc. - they will be non-existent for search engines.
After crawling a page the next step is to index its content. The indexed page is stored in a huge database, from where it can later be retrieved. The process of indexing is to identify  the words and expressions that best describe the page and assigning the page to particular keywords. It is not possible for a human to execute such amount of information but search engines do this task cleanly. Sometimes search engines not able to get the meaning of a page correctly but if you help them by optimizing it, it will be easier for them to classify your pages correctly and for you – to get higher page rankings.

When a query comes, the search engine processes it – i.e. it compares the search string in the search query with the indexed pages in the database. Since it is likely that more than one page (practically it is millions of pages) contains the search string, the search engine starts calculating the relevancy of each of the pages in its index with the search string.

There are various algorithms to calculate relevancy. Each of these algorithms has different relative weights for common factors like keyword density, links, or metatags. That is why different search engines give different search results pages for the same search string. What is more, it is a known fact that all major search engines, like Yahoo!GoogleBing, etc. periodically change their algorithms and if you want to keep at the top, you also need to adapt your pages to the latest changes. This is one reason (the other is your competitors) to devote permanent efforts to SEO, if you'd like to be at the top.

The last step in search engines' activity is retrieving the results. Basically, it is nothing more than simply displaying them in the browser – i.e. the endless pages of search results that are sorted from the most relevant to the least relevant sites.
You can find more details on Blogger.com

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