what is the difference between seo, sem, smm

Search engine marketing, or SEM, is a form of Internet marketing that seeks to promote websites by increasing their visibility in search engine result pages (SERPs) through the use of paid placement, contextual advertising, and paid inclusion. The industry peak body Search Engine Marketing Professional Organization (SEMPO), includes search engine optimization (SEO) within its reporting, and SEO is also included in the industry definitions of SEM by Forrester Research, eMarketer, Search Engine Watch, and industry expert Danny Sullivan. The New York Times defines SEM as 'the practice of buying paid search listings'.
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