A digital circuit is typically constructed from small electronic circuits called logic gates that can be used to create combinational logic.Each logic gate is designed to perform a function of boolean logic when acting on logic signals. A logic gate is generally created from one or more electrically controlled switches, usually transistors but thermionic valves have seen historic use.

Digital data, in information theory and information systems, is information represented as a string of discrete symbols each of which can take on one of only a finite number of values from some alphabet, such as letters or digits.An example is a text document, which consists of a string of alphanumeric characters.The most common form of digital data in modern information …