Yeah SEM includes SEO,PPC and SMO.But most say search engine marketing is all about running and getting success with paid advertising(PPC) like Google Adwords.
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Sem is one of the best tool of internet marketing which work as pay per click advertisement services. It is the best for promot anything on internet because it directly make links on the high search result of search engine and in other websites. It look like an earning source for search engine which provide well money.
Search engine marketing (SEM) is the simplest and most transparent way to help your online success, reaching and rising qualified traffic to your web portal. The pay per click advertisement has proven to be one of the prime aspects of the online success in the present market.