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Sem in Thailand by Sem.in.th
SEM (Search Engine Marketing)

SEM is the abbreviation from Search Engine Marketing. SEM is divided in
two forms.

1. (SEO) Search Engine Optimization
SEO or Search Engine Optimization is free Search Engine Marketing.
When you search a keyword, the search result will be shown on the
left that is called SEO or Search Engine Optimization.

2. (PPC) Pay Per Click
PPC or Pay Per Click is Paid Per Click Search Engine Marketing.
When you search a keyword, the search result will be shown on the
right (sometimes on the left on sponsored link)
that is called PPC or Pay Per Click.