Search engine optimization (SEO) is the process of improving the volume and quality of traffic to a web site from search engines via "natural" ("organic" or "algorithmic") search results.*
Optimizing your web site for the major Search Engines is the single most cost-effective way to increase your web site’s traffic, generate leads, and obtain additional sales with-out paying for advertising.
When done correctly, SEO only needs to be done once and then monitored and tweaked as needed. Succeeding on the web is not that difficult, but to do so, you need to be where they are looking. There are 150 million searches done on the web every day. If you're not appearing in the search results, then It’s time you made your site more visible.
What is SEO
Here is Search Engine Optimization in a nutshell. Remember there are two parts to the equation. Part 1. In its most basic form, SEO is the process of taking certain “on the page factors” of your website and manipulating or optimizing them for specific keywords or phrases. Thus when a query is processed at Google, Yahoo or MSN, and this query matches information pertaining to your website then you show up in the search results, resulting in free traffic being sent to you.
Part 2. The second part of the equation is link building. Link building is what helps you get into the top 30 results.
W2K only participates in what the industry calls "White Hat" practices, and works with-in the guidelines laid down by the search engines themselves. The following link can answer more questions:
* Description taken from Wikipedia