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Ya I Agree.. With that "SEM or Search Engine Marketing encompasses all aspects of search marketing including PPC, SEO, affiliate programs, social media campaigns, etc." and "SEM or search engine marketing is the process of buying traffic through paid search listings."

SEM is The Search Engine Marketing... It is the process of gaining website traffic by purchasing ads on search engines.

At Search Engine Land, we generally use SEM and/or “Paid Search” to refer to paid listings, with the longer term of search marketing used to encompass both SEO and SEM. Below are some of the most common terms also used to refer to SEM activities:

-Paid search ads
-Paid search advertising
-PPC (pay-per-click) *
-PPC (pay-per-call) – some ads, particularly those served to mobile search users, may be charged by the number of clicks that resulted in a direct call from a smartphone.
-CPC (cost-per-click)
-CPM (cost-per-thousand impressions)
-Most search ads are sold on a CPC / PPC basis, but some advertising options may also be sold on a CPM basis.