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Software, in its most general sense, is a set of instructions or programs instructing a computer to do specific tasks. Software is a generic term used to describe computer programs. Scripts, applications, programs and a set of instructions are all terms often used to describe software.
The theory of software was first proposed by Alan Turing in 1935 in his essay "Computable numbers with an application to the Entscheidungsproblem." However, the word software was coined by mathematician and statistician John Tukey in a 1958 issue of American Mathematical Monthly in which he discussed electronic calculators' programs.
Software is often divided into three categories: