This acronym is Search Engine Marketing or Search Marketing that is short term. It is not only sponsored links , but the set of strategies marketing to search. This includes in SEM: SEO, paid placement and to contextual ads. It is an umbrella for other terms. In a formula, it would be this:
SEM = SEO + PPC + (Other search for strategies)
That translated into Portuguese would look like:
Marketing on search sites (or search marketing) = + + Links Search Engine Optimization (Other search for strategies)
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So if you talk to makes SEM and SEO, is being redundant. Or you do SEM (search engine marketing) or do PPC (sponsored links) and SEO.
Summary
I think everyone who has made a CBT or monograph should remember that every statement or concept in an academic paper has to have a reference. A material of other authors to support the terms. Where the subject is unheard or not current language, the possibility exists to translate the word or to create a term, but the concept it has to be kept. If the SEO market, we have many reference materials for a long time. I confess to not agree with some translations, but we have to follow the standards for the good of our area.
You have any other term that you think is important to set or where there is doubt? Point out that we will extend this article.