Search Engine Optimization is usually thought to be the same as SEM, however they are distinctly different. Search engine optimization is really utilized mainly to online pages, i.e. the pages inside your companies web site. Many individuals will speak about “online SEO” (optimization for your personal web site) and “offline SEO” (a method concerning the creating up of back-links and making offline content material this kind of as write-up submissions, forum submitting and so forth,- even though individually we see the latter as falling in to the SEM class.