Pay Per Impression (PPI) is a popular advertising model used by many <a class="wpil_keyword_link" href="https://froggyads.com/blog/online-marketing-fundamentals-learn-the-basics-with-lynda-2/" title="online advertising" data-wpil-keyword-link="linked" data-wpil-monitor-id="185448">online advertising services and advertising networks. Under this model, advertisers pay a fee for every thousand times their ad is viewed by users, regardless of whether an…





