This document provides an overview and guide to digital video advertising. It discusses the size and growth of the digital video advertising market, trends in the industry, the digital video advertising landscape and key players. It also covers topics like video ad formats and units, online video platforms, creative decisions, pricing models, video ad tech, audience data and measurement, mobile video, video automation, and challenges in the digital video space. The guide is intended to help publishers, marketers and brands understand the evolving video landscape and provide best practices.