SEO = search engine optimization – is a term that's used to describe various techniques designed to promote websites in search engines, such as Google or Yahoo. Some of these techniques include:

1) Using relevant keywords in the <title> of html pages;
2) Using relevant keywords throughout the text;
3) Making sure other websites link back to your website using the relevant keywords within the link name;
4) Signing alt tags for images;
5) Clean, compliant html code