Web Site Optimization is a part of a business's marketing efforts which is aimed at increasing the traffic (number of visitors) to your Web site from the search engines, as well as their conversion (the percent of visitors who become buyers).

The first is achieved by increasing your search engine visibility, i.e. the position of your site in the search engine results for certain keywords people type in the search box to obtain these results. That is, if someone wants to find and buy a digital camera, they will open, say, Google search engine and type "digital camera" in the search box. Google will list, for instance, 42 million results. If you sell digital cameras or offer any services related to them, your site may be listed among these 42,000,000 results

.And here, everything depends on how deep you are. If you are on the first or second page of the search results, it's more likely that such visibility will bring you many visitors and customers from Google. If you are the 300th result, it's unlikely that someone will come to you from Google at all.