PPC (Pay-Per-Click): This is the most common type of SEM

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PPC (Pay-Per-Click): This is the most common type of SEM. In PPC advertising, advertisers bid on specific keywords relevant to their target audience. When someone searches for those keywords, the ad is displayed at the top or bottom of the search results. Advertisers pay a fee only when someone clicks on their ad, hence the name "pay-per-click."

CPI (Cost-Per-Impression): While less common in SEM, CPI  Color Correction refers to the cost an advertiser pays for every 1000 ad impressions, regardless of whether the users click on the ads or not. This is more typical in display advertising rather than search engine marketing.

As of my last update in September 2021, SEM stands for Search Engine Marketing, which is a digital marketing strategy to promote websites by increasing their visibility in search engine results pages through paid advertising. There are three main types of S EM.


PPC (Pay-Per-Click): PPC is the most common form of SEM. Advertisers bid on specific keywords relevant to their target audience. When users search for those keywords, the ads appear at the top or bottom of the search results. Advertisers pay only when someone clicks on their ad. Google Ads (formerly known as Google AdWords) and Bing Ads are popular platforms for PPC advertising.

CPC (Cost-Per-Click): While CPC is often used interchangeably with PPC, it refers specifically to the actual cost per click an advertiser pays for each click on their ad. In a PPC campaign, advertisers set a maximum bid they are willing to pay for a click, and the act ual CPC may be lower, depending on the competition and ad relevance.