Most of us know that SEO (Search Engine Optimization) is a method used to help your website have good rank organic search engine result page (SERP). Another important method for business is SEM (Search Engine Marketing) which is includes things such as SEO itself, paid listings, ads and other search-engine related services. While the two are almost similar, however SEO and SEM are different.
Search Engine Optimization (SEO) can be described as strategy to ensure that a site is accessible to a search engine and improves the chances that the site will be found by the search engine. The goal of successful SEO is to obtain a high-ranking placement in the search results page of a search engine in order to get more SERP visibility. You can also improve your SEO here: http://wp.me/p2K6rY-4h
SEM is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results pages (SERPs) through optimization and advertising. SEM may use search engine optimization (SEO), that adjusts or rewrites website content to achieve a higher ranking in search engine results pages or use pay per click listings.
SEM is a broader term than SEO. Where SEO aims to provide better organic search results, SEM uses the search engines to advertise your website or business to internet customers (visitor/user) and send a more targeted traffic to your Web site.