A computer software collection of programs.And program is a organized set of instructions designed to direct a computer to perform certain task. The programs enable computer to receive the input from the user, store the information, make decisions, manipulate and output data in the correct order or format.
-> in other words, software consists of set of instructions that use arithmetic and logical capabilities of  the hardware units to perform some actions and produce output.
-> software is invisible, means it is not physical like computer hardware.
-> software is generally categorized into 1) system software and 2) Application software


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