This document discusses electronic paper (e-paper) technologies, including gyricon, electrophoretic displays, electrowetting, and electrofluidic displays. It notes that e-paper was developed in the 1970s and aims to mimic the appearance of ordinary ink on paper. The technologies are described and their applications mentioned. Advantages of e-paper include low power consumption, readability, retention of the displayed image without power, and being lightweight. The document concludes that e-paper may replace paper in many uses like books, newspapers and monitors in the near future.