The term “Search Engine Marketing” was proposed by D. Sullivan in 2001 to cover the spectrum of activities involved in performing SEO, managing paid listings at the search engines, submitting sites to directories, and developing online marketing strategies for businesses, organizations, and individuals.
Some of the latest theoretical advances include Search Engine Marketing Management(SEMM). SEMM relates to activities including SEO but focuses on return on investment (ROI) management instead of relevant traffic building (as is the case of mainstream SEO). SEMM also integrates organic SEO and PayPerClick SEO. For example some of the attention is placed on the web page layout design and how content and information is displayed to the website visitor.