The following types of ad campaigns are available on Google.Cost Per Click (CPC) / Pay Per Click (PPC) – A predefined amount will be deducted from the campaign when someone clicks on your ad.  Cost Per Impression (CPI) – The ad will be shown to prospective clients, based on the taste and search data. The charging off will depend on the number of times the ad is shown. Cost Per Engagement (CPE) – The payment will be based on the engagement, i.e. clicking on “buy now”, “watch the video” etc.