Digital data system is a technology that uses a discrete values (discontinuous). In contrast, analog system (non-digital) use a range of continuous values to represent information. Although discrete digital representation, they can be used to carry information either discrete, such as numbers, letters or other symbols, or continuous information approaches, such as sound, pictures, and other measurements of continuous systems.
Digital comes from the same source as the word digit and digitus (the Latin word for finger), as fingers are used for discrete counting. Most often used in computing and electronics, especially where real-world information is converted to digital format for digital audio and digital photography.
It is estimated that in 2007, 94% of the world information technology stored is digital (up from just 3% in 1993). In 2002 was considered to be the year when this type of human being able to store more information in digital, rather than in the analog format (“the beginning of the digital age”).
When data is transmitted, or indeed handled at all, a certain number of votes go to the signal. Noise can have several causes: data transmitted wirelessly, such as by radio, may be received inaccurately, suffer interference from other wireless sources, or pick up background noise from the rest of the universe. The microphone picks up the signal meant and background noise without discriminating between them; This vote is to some extent included when audio is converted to digital.