What is SEO?
Search Engine Optimization (SEO) is a way to improve your web site so that it will appear closer to the top positions in the search results of Google, Yahoo, Bing or other search engines.
When you perform a search on Google (or any other search engine) the order by which the returning results are displayed, is based on complex algorithms. These algorithms take a number of factors into account to decide which web site (or blog) should be shown in the first place, second place etc.
Optimizing your web site for search engines will give you an advantage over non-optimized sites and you increase your chances to rank higher.