User:ViperSnake151/Second screen

The 'second screen refers to the use of personal computers or other mobile devices (such as smartphones and tablets) to serve as a companion to other forms of digital media (such as a television program), allowing the user to access additional content and other forms of interactive features to improve or extend their experience.

Examples
The concept of a second screen experience can refer simply to the use of a mobile device whilst viewing a program, often to look up information relating to it, or to the use of a social networking services and social media outlets such as Twitter to post and view the reactions of others.