SEO stand for Search Engine Optimization. It is most commonly used practice on improving and enhancing website pages to be seen in top ten(10) of SERPs or Search Engine Result Page(s) - Google, Yahoo, and MSN.

In Search Engine Optimization, there are two ways to optimize your website pages.

First is, the on-site or on-page(s) optimization. This is where you improve your HTML tags - title, meta keywords, meta description, pages url structure, content headings(h1 to h6, strong), image(img) alt attribute, and anchors(a href) title attribute.

Second is, the off-site or off-page(s) optimization. This is where you distribute your content pages to article sites, social media(video, music, image) sites, forum sites, press release sites, blog community sites, social networking site, and many more. In short, we are building inbound and/or back links directed to website pages.

Read More - http://useosecrets.blogspot.com/2009/11/what-does-seo-means.html