Digital sign that deliverer binary numbers (0 and 1) of both ON (the main) or OFF (the amount zero). Unlike an analog transmission, that will be constant and much more such as a trend, an electronic signal may be the sections which are up or down for both ON or OFF and discontinuous within the example.

A digital computer can perform its operations in the decimal system, in binary, in ternary or in other numeral systems. As of 2014, all digital electronic computers commonly used, whether personal computers or supercomputers, are working in the binary number system and also use binary logic. A few ternary computers using ternary logic were built mainly in the Soviet Union as research projects.

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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.