This report outlines spending trends in the fragmented online display advertising market. For B2C marketing professionals, it offers guidance on how to allocate ad dollars across a variety of channels. For media and adtech companies, it provides insight into how their digital revenues are likely to evolve and the digital channels in which they should be investing. The forecast provides spending detail segmented by media format, device, mobile platform, inventory source, pricing scheme, and industry end market. For context, we also include offline advertising spending.