Search Engine Optimisation is the process of optimising a page so that it performs better in organic or natural search engine results. It is a form of search engine marketing.
Search Engine Marketing describes any marketing efforts done to promote site in search engines. (PPC) advertising could also be considered a part of search engine marketing. Many marketers use the term SEM to specifically refer to PPC advertising as a way to differentiate between organic SEO and paid SEM.
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