SEM is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results through SEO and PPC.
http://seo-san-jose.net/SEO-San-Jose-SEO-Blog/2014/11/seoppcsem-san-jose-seosan-jose-ppcsan-jose-sem-website-marketing-in-san-jose-san-jose-internet-marketing/
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