This document discusses different types of in-game advertisements (ads) and their pros and cons. It begins by explaining that understanding ads will help game developers maximize revenue. It then covers various topics related to ads, including what drives internet revenue, the growing popularity of online video ads, and the US advertising market. The document also defines key players in the ads ecosystem like guaranteed and remnant inventory buyers. Finally, it provides a table comparing the pros and cons of different ad types like pre-game, click-away, and inter-level ads.