The ingredient that enables a computer to perform a specific task is software,
which consists of instructions. A set of instructions that drive a computer
to perform specific tasks is called a program. These instructions tell the machine's physical components what to do; without the instructions, a computer could not do anything at all. When a computer uses a particular program, it is said to be running or executing that program.
Software Brings the Machine to Life
Although the array of available programs is vast and varied, most software falls into two major categories: system software
and application software
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