Digitized information is recorded in binary code of combinations of the digits 0 and 1, also called bits, which represent words and images. Digital technology allows immense amounts of information to be compressed onto small storage devices that can be easily stored and transported. Digitalization also accelerates the speed of data transmission. Digital technology has transformed the way people communicate, learn and work. Telecommunications have relied on digital methods to transmit messages. In the early 1980s, enhanced fiber optics enabled the development of digital communications networks. Digital technology has replaced analog signals for many forms of telecommunications, particularly cell phones and cable systems. Analog-to-digital converters used pulse code modulation (PCM) to transform analog data into digital signals. Compared to analog broadcasts, digitized signals were less distorted and could be distorted easily