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Data is the result of facts or observations, the logical induction of objective things, and the original materials used to express objective things. Data can be continuous values, such as sound, images, etc., called analog data; It can also be discrete, such as symbols and characters, called digital data. In a computer system, data are represented in the form of binary information units 0 and 1.

Data refers to symbols that can record and identify objective events, as well as physical symbols or combinations of these physical symbols that record the nature, state and relationship of objective things. It is a recognizable abstract symbol.