We were very lucky in being able to run our course competition with real data. You will have to predict clicks in mobile advertising. In display and mobile advertising, the most relevant technical development in recent years is the growth of Real-Time Bidding (RTB). Billions of display ad impressions are purchased on a daily basis through a public auction hosted by RTB exchanges. The auction is per impression and the process usually occurs less than 100 milliseconds before the ad is placed. In this context, demand side platforms (DSPs) were created to help advertisers manage their campaigns and optimise their real-time bidding activities. One of their main tasks is to predict the click-through rate (CTR) for ads and calculate the bid price according to the estimated CTR. For this challenge, Jampp, one of the key players in the mobile adtech industry, has provided a week’s worth of data to build and test models predicting CTR.