In a very simple but mathematical language SEO is the subset of SEM. Mean SEO is part of all practices in SEM. SEO stands for search engine optimization where SEM stands for search engine marketing. From the words itself SEM seems a bigger word as is occupied all practices which market a product on internet or search engine. In SEM practices adwords might be a part of this, other type of PPC practices also a part of SEM. While in SEO, the only practices which rank website on the top among the organic search results. Now a days seach engine marketing is being the more trending word than SEO. However both terms have their own importance.
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