subject: History of Search Engine Optimization [print this page] SEO is the most important part of an internet marketing campaign. It drives quality and targeted internet traffic to a website. In addition to SEO, webmasters also require advertising campaigns to drive traffic to their website. While calculating the ROI of a website, internet marketing, that combines both, SEO and advertising, turns out to be the most persuading technique and it should be implemented with properly setting up an analytical application to measure the true success of the website.