Being in the SEO and SEO content writing sector since past 2 and a half year, it seems SEO is a complete package that covers Search Engine Compatible content writing, proper white hat optimization techniques, genuine link building techniques to make any website reach the highest PR over leading search engines. Apart from that the layout and designing codes of the site also affect the performance of any site, according to the SEO point of view. When all these things are in the right proportion, certainly no one can beat you in scoring the top notch position over SERPs.
Content is the king along with proper implementation of onsite and offsite activities will be the success factor for your website.