SEO or Search Engine Optimization is the process of optimizing a website to boost its organic traffic coming from search engines. It follows search engine algorithms naturally in order to rank in SERPs. This one is the search engine crawlers which will evaluate if the site page is worth to be ranked or not. Search Engine Marketing is a form of Internet marketing which involves online promotions by increasing website’s online presence either through SEO or PPC. Though Search Engine Marketing contains purchasing advertising PPC or pay-per click, to increase online visibility.
After the Google’s Penguin and Panda updates, many SEO Companies now diverting themselves towards SEM.