We live surrounded by screens. In houses, in streets, in jobs, in meters, in airplanes, in bars, in stores, in shopping centers. The screens form an indispensable part of our daily life. We can not live without them. We can not work without them. We can not travel without them. If a few years ago his presence was limited to areas such as cinemas or the home, the screen is now ubiquitous and manifests everywhere, in the public space and in the private; a screen that takes on different shapes, functionalities and sizes, which is multiplied and changed with each new generation of devices. The screen has become the most important prosthesis in our lives, an inevitable extension of ourselves. We spend more time in front of a screen than any other type of device. We use it to read books, to watch movies, to listen to music, to play video games, to communicate with others, to socialize, to entertain us, to inform us and to work. We all seem to know what a screen is and yet we know very little about its history and the multiple phases through which it has traveled, especially the younger ones, who have been born with the latest generation screens of computers, video games and mobile phones as main references. This book examines, from a genealogical perspective attentive to the hybridization between technologies, means, uses and practices, the prolonged history of the screen, from its origins with the cinematographic screen to that tiny, ubiquitous and global screen that is the screen of the mobile phone . Knowing the history of this particular technical device is now more necessary than ever, because our life is already completely inseparable from it.