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A computer program (called computer program) - a string of symbols describing the calculations in accordance with valid rules, called a programming language [1]. The program is normally executed sooner than a computer (for model, displays the cobweb number), then undeviatingly - if it is expressed in a jargon understandable during the machinery or indirectly - if it is interpreted by another program (the interpreter). The program can be a course of instructions that represent the modifications of the vehicle but it can also chronicle the figure in another modus operandi (eg, lambda calculus).
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The formal expression of the calculation method in the protocol of human terminology understandable to the rise organization is called when the program expressed in machine-readable (that is, on the numbers, and more exact ones and zeros) is called organization structure or binary form (executable).

Computer programs can be classified according to teir applications. Thus distinguished by user applications, operating systems, video games, compilers, and others. Programs embedded backwards the tool is referred to as firmware.