Businesses online depend on Google's search results for their visibility. If your site is able to reach page 1 of the search results of Google, Yahoo or Bing, you will have huge traffic coming to your site.
http://kjonmarket.com/services1/search-engine-optimization/ It's necessary to know why online businesses want to be on the first page of these major search engines--it is because Internet users rarely if ever go beyond page 2 of the search pages. So, if your site is listed on page 3 or after, you will lose out on a large chunk of Internet users who could well be your future customers.