With the anticipation of GDPR, the topic of transparency in the industry is getting hotter by the second. Come May, digital advertisers will face the new data privacy regulation as GDPR will take effect in the EU. This is where transparency comes into play. Today, we will have a refresher on this open form of communication and its significance. We will look at the three sides of transparency from the following perspectives: the publisher, the advertiser, and the user.