Common search engine principles

Spider - a browser-like program that downloads web pages.

Crawler – a program that automatically follows all of the links on each web page.

Indexer - a program that analyzes web pages downloaded by the spider and the crawler.

Database– storage for downloaded and processed pages.

Results engine – extracts search results from the database.

Web server – a server that is responsible for interaction between the user and other search engine components.


Spider+Crawler+Indexer component group might be implemented as a single program that downloads web pages, analyzes them and then uses their links to find new resources. However, the components listed are inherent to all search engines and the seo principles are the same.

Spider:- This program downloads web pages just like a web browser. The difference is that a browser displays the information presented on each page (text, graphics, etc.) while a spider does not have any visual components and works directly with the underlying HTML code of the page. You may already know that there is an option in standard web browsers to view source HTML code.

Crawler:- This program finds all links on each page. Its task is to determine where the spider should go either by evaluating the links or according to a predefined list of addresses. The crawler follows these links and tries to find documents not already known to the search engine.

Indexer. This component parses each page and analyzes the various elements, such as text, headers, structural or stylistic features, special HTML tags, etc.

Database. This is the storage area for the data that the search engine downloads and analyzes. Sometimes it is called the index of the search engine.

Results Engine. The results engine ranks pages. It determines which pages best match a user's query and in what order the pages should be listed. This is done according to the ranking algorithms of the search engine. It follows that page rank is a valuable and interesting property and any seo specialist is most interested in it when trying to improve his site search results. In this article, we will discuss the seo factors that influence page rank in some detail.

Web server. The search engine web server usually contains a HTML page with an input field where the user can specify the search query he or she is interested in. The web server is also responsible for displaying search results to the user in the form of an HTML page.






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Keyword Research

Keywords are called that for a reason; they're one of the keys to making sure your web site is seen by searchers who want what you have to offer.

keywords are the words or phrases that people enter into search engines in order to find whatever it is they are searching for. If you want your site to be listed (and listed high) you need to think carefully about the words people could use to find your site, and use these keywords in appropriate and relevant places in your site. You also need to think about keyword density and keyword positioning if you are to use keywords successfully.

If you're building a site from scratch, you should be thinking about keywords when creating the pages that make up the site as well as when producing content for the site. Keywords need to be used in your page titles and in META tags as well as in the content. You also need to think about using keywords in heading text, bold text and in lists. Using keywords effectively, however, is far easier than choosing keywords effectively. Similarly, if you're working on improving the
rankings of an existing site, you'll need to review not just the content, but the markup behind the pages as well.

Choosing effective keywords is about making sure your site is ranked highly in returned search results for the most commonly used search strings. You should focus on choosing keywords that not only focus on your products and/or services but also on your company's name and related subjects.

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What is SEO

What is search engine optimization?

Search Engine Optimization (SEO) is the process of increasing the amount of visitors to a Website by ranking high in the search results of a search engine. In order to rank higher among your competitors, you have to make the search engines like your website. The higher Website ranks in the results of a search, the greater chance that site will be visited by a user.

What are search engines?

There are three basic categories of search engines:

1) Spider based search engines, such as Yahoo, Google and etc.
2) Directories powered by humans such as Open Directory (DMOZ).
3) There are also combinations or "hybrids" of search engines and directories.

How do search engines work?

Just in case you're unfamiliar with how search engines work, here's a brief explanation: Most search engines "spider" the Web looking for new pages to add to their database or index on a daily basis. You can also manually submit your site or use a software.

Once your pages are added to the index, people can do a search on the Internet for various keywords to find pages that "best" match their search criteria. Appearing within the first few pages of the search is critical to people finding you.

These matches will be ranked or positioned in order of importance (algorithm). The exact rules they use to rank pages for relevance are generally kept a secret and change often. Different search engines use different ranking criteria and is constantly changing.

How do search engines rank web pages?

After submitting your site to search engines, your website is indexed into a search engine's database. Search engines rank websites using a technology - called algorithm. Websites are ranked in order of importance (relevance). The most relevant site based on a search criteria makes it to the top of search engine results.

When a search engine spider analyzes a web page, it determines keyword relevancy based on an algorithm, which is a formula that calculates how web pages are ranked.

Most of the major search engines (including Google, Yahoo, MSN) uses sophisticated techniques to search billions of documents, files and websites within a span of few seconds and returns the information to the user a list of files that matches your topic of interest. Search engines will also sort in the order of relevance - called search results.

People finding your site via search engines are more qualified targets for your products and services because they have actively sought out your site by typing a search phrase directly related to your site content. It's the perfect web site promotion!

Why do you need search engine optimization?

Below are a few facts which should leave you in no doubt that search engine optimization should form an integral part of every web promotion strategy.

• Over 80% of Internet users find websites through search engines.
• 90% of Internet users do not go past the top 30 search engine results. They simply type something else in if they can't find a relevant site.
• 75% of Internet users have the intention of purchasing a product or service when using search engines.
• Professional search engine optimization is about twice as effective as all other Internet marketing methods and eight times more effective than costly banner advertisements.

Therefore, ranking highly in search engines and directories should be critical to your Internet marketing strategy. Unfortunately, many online businesses fail to address the importance of search engines, building their site without any regard to search engine compatibility at all.

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