SEO is improving the volume and quality of visitors to a web site from search engines for targeted keywords. To really understand SEO you need to understand How Search Engines work. SEO has both objectives and methods, essentially what you want to achieve and how you want to achieve it.

Follow this link to learn how search engines like Google and Yahoo work.

The Google Keyword tool is very useful in helping you determine how many people are looking for your type of business.

Follow this link to find out more about the Google Web Master Tools

They both work, as long as users understand what is involved..