Search Engine Marketing (SEM) operates on the bidding model of Google Ads. The various models include Pay per Click (PPC)/Cost per Click (CPC), where the advertiser has to pay Google on every click on his/her advertisement; and Pay per Milli (PPM), where the advertiser has to pay Google only after 1000 impressions on his/her advertisement.
Unlike Search Engine Optimization (SEO), the results obtained by the means of Search Engine Marketing (SEM) are completely inorganic. The major objectives of the companies or brands opting for Search Engine Marketing (SEM) are that they are focused upon driving instant sales instead of brand building.