TV remains the single most important and engaging source of information and entertainment. U.S. teenagers spend more than three times of their spare time watching TV than on social media. The global footprint of TV has been enhanced recently by online video, which includes online TV. U.S. consumers watch more movies online than on DVDs, Blu-ray discs and other physical video formats. This trend is driven by the flexibility of on-the-go mobile entertainment and the widespread adoption of video-capable smartphones and tablets. These personal devices have become ubiquitous with greatly expanded computing power and memory, improved displays, and network connectivity. The accelerated growth of video traffic on the Internet is expected to continue. However, supporting high-quality video delivery presents a significant challenge to Internet service providers due to the higher bandwidth demands compared to data and voice traffic.