Advertisers bid on each ad impression as it is served. The impression goes to the highest bidder and their ad is served on the page.[citation needed] Ad fraud happens when scammers (or any parties with ill intent) try to trick digital ad networks by falsifying impressions and clicks using bots. https://nativeadvertenties27147.daneblogger.com/27742308/5-eenvoudige-uitspraken-over-reclameplatform-uitgelegd