Internet studies now show that over 85% of the 391 million people online everyday use search engines on a daily basis while surfing. With such a staggering traffic and a high level of commerce/revenue generation using the Internet, it is no surprise that Search Engine Optimization has become one of the hottest marketing topics on and off the Internet.
So what is SEO (Search Engine Optimization?)
A term that refers to the customization of a webpage or a number of webpages to rank high in search engines for specific keywords.
With different search engines ranking websites differently, it has become a compounded challenge to develop websites that will reach out to maximum number of users. Search Engine rank websites depending on a number of factors that we will get into later. When a person searches for certain keywords, based on the the rankings, the websites are listed. Sometimes search engines reveal hundreds of thousands of web pages on a search topic. SEO is a technique of getting one's website as high as possible in such listings.
In order to understand more about Search Engine Optimization (SEO), let us look into how a search engine works.
Components of a Search Engine
Search engines consist of five discrete software components:
(a) Spider: It is a robotic browser like program that downloads webpages.
(b) Crawler: As a spider downloads pages, it can strip apart the page and look for "links". It is the crawlers job to then decide where the spider should go to next based on the links, or based upon a preprogrammed list of urls.
(c) Indexer: An indexer rips apart a page into it's various components and analyze them. Entities such as, titles, headings, links, text, constructs, bold, italic, and other
style portions of a page are ripped apart and analyzed.
(d) Database: A warehouse of the pages downloaded and processed.
(e) Search engine results engine :
It is the results engine's job to decide what pages matches a user's search. This is
the portion of a search engine you interact with when you perform a search.
How Search Engines Work?
Before optimizing a web site, we must understand how search engines and their
spiders work.There presently exist two types of major search engines,
(a) Spider indexed
(b) Human indexed.
For the most part, search engines were designed to index and display web sites
and their pages. Sort of an online yellow pages. When a search engine displays its results, the pages seen are a result of how the site was either submitted or displayed on that page.
Search engines are displaying what was fed to them from an information standpoint. How this information is “fed” to the search engine is where some of the major differences come into play. You are in total control of what a search engines sees when it comes to your site.
The main idea of web site optimization is about getting ranked on search engines.
It has nothing to do with how fancy your web site looks. About 95% of the search engines on the Internet are self indexing or spider robot indexed. The other 5% are human indexed.he important point to learn is that human indexed search engines cannot be manipulated.So human indexed search engines represent a very small percentage of search engines.
(a) Spider Indexed Search Engines
These are actually just large databases of web sites and they operate entirely on their own without much human intervention. They exist solely to index web pages.
A spider is nothing more then a piece of 'computer software' that moves silently from web site to web site gathering information. When you contact the search engine, the spider robot will visit your site. Once the search engine receives the signal, the
spider will arrive, look at your site, read the pages, index your content and follow links to move on. The spider’s only reason for existence is to capture and index the pages of your web site.
Every search engine basically has its own spider that it deploys to do its indexing.
Because of this, you must ask all of the search engines individually to deploy its spiderto your site. After the spider reads and captures the information on a web site, it will eventually list its findings on the search engine that deployed it.
The vast majority of search engines index their pages using spiders.
These search engines include Altavista.com, Google.com, Msn.com, Aol.com, and lycos.com
(b) Human Indexed Search Engines
It is also Known as 'Directories''.These are manually indexed search engines.
it does not use the spiders to visit the web page.When you submit your web site to a directory, an employee actually examines your site and does the work manually.
Usually, you will be indexed based on where the person doing your indexing feels you belong.Because of this reason, it is almost impossible to manipulate these search engines.
The one of the major difference between a Spider indexed search engine and Human indexeed search engine is that unlike spiders that return and re-index your web site, human indexed don’t have this option to re-indexing.
(4) How Search Engines Rank Web Pages?
The Search for a particular topic using a crawler-based search engine,it will sort through the millions of pages it knows about and present you with ones that match your topic.The matches will even be ranked,so that the most relevant ones come first.Of course, the search engines don't always get it right. Non-relevant pages makes some troubles.So,inorder to to hanle this situation they follow a set of rules, known as an algorithm. One of the the main rules in a ranking algorithm involves the location and frequency of keywords on a web page.
In order to search a term the Pages with the search terms appearing in the HTML title tag are often assumed to be more relevant than others to that topic.Search engines will also check to see if the search keywords appear near the top of a web page, such as in the headline or in the first few paragraphs of text.They assume that any page relevant to the topic will mention those words right from the beginning.
Frequency is the other major factor in how search engines determine relevancy.
A search engine will analyze how often keywords appear in relation to other words
in a web page.Those with a higher frequency are often deemed more relevant than other web pages.
Website links:
http://searchenginewatch.com,
http://www.webmasterworld.com
http://www.seoinc.com
http://www.searchenginestrategies.biz
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