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I just defined both terms in googles definition thingy. go google type define:the the word
SEM
This is a newer term and separates what was once part of the function of a Search Engine optimizer, Search Engine Marketing specifically is the function of locating, researching, submitting, and positioning a web site within the proper search engines for maximum exposure and effectiveness. SEM may also include the function of choosing the target keywords and keyword phrases for the web site's meta tags
SEO
The term used to describe the marketing technique of preparing a website to enhance its chances of being ranked in the top results of a search engine once a relevant search is undertaken. A number of factors are important when optimising a website, including the content and structure of the website's copy and page layout, the HTML meta-tags and the submission process.
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