1 Comscore OTT Intelligence, US, Comscore’s definition, aligned with the IAB definition, for over-the-top (OTT) is any video streamed on 'a device that can connect to a TV, or functionality within the TV itself, to facilitate the delivery of internet-based video content, such as Roku, Apple TV, Smart TVs, game consoles, etc.' Oct. 2016–April 2018.

2 YouTube Internal Data, Global, Based on 90-day average of watch time for living-room devices, which include smart TVs, Roku/Apple TV and game consoles, accurate as of Dec. 2018.

3 Google-commissioned Nielsen Custom Fusion Study, US, Desktop, mobile and TV fusion, TV measurement of television distribution sources, reach among people 18–49, May 2018.

4 Google-commissioned Nielsen Custom Fusion Study, US, Desktop, mobile and TV fusion, TV measurement of television distribution sources, reach among persons 18–49, May 2018.

5 Comscore OTT Intelligence and Custom Reporting, US, based on Total Home Panel, Sept. 2017 vs. Sept. 2018.