This series of lectures provides an in-depth understanding of digital advertising, its importance, and how it works. It covers the basics of advertising, the various formats of digital advertising, and the trends in ad spending. The lectures also discuss the unique aspects of digital advertising, such as its trackability, interactivity, personalization, and cost-effectiveness. Furthermore, the lectures delve into the advertising funnel, the FCB Grid, and various advertising metrics, including impressions, gross rating points, cost per thousand (CPM), click-through rates (CTR), cost per action (CPA), and return on ad spending (ROAS).