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The word software is also sometimes used in a more narrow sense, meaning application software only. At the lowest level, executable code consists of machine language instructions specific to an individual processor âtypically a central processing unit (CPU).
Software refers to the programs that you use on your computer (like a word-processing program) or the programs that make your computer work (you physically cannot touch these). Programs are also called applications. CPU (Central Processing Unit): This box is the brain of a computer system.