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3.1 INTRODUCTION

A computer system consists of hardware, the electronic devices that are capable of computing and manipulating information, and software (set of instructions) that carries out predefined tasks to complete a given job. As we know, a computer cannot think or perform on its own. It performs operations like addition, subtraction, multiplication, and division only when the user instructs it to do so. The user issues instructions and the CPU acts in accordance with the instructions. The sets of instructions, which control the sequence of operations, are known as programs, and collectively programs are called software. It is an intangible commodity, that is, the part of a computer system that users cannot touch.

We can equate hardware and software with human body and human intelligence, respectively. All human physical actions such as walking and eating are based on the thoughts and feelings, which is raised by the brain. If the brain does not raise thoughts and feelings, we do not perform any physical activity. Similarly, the actions and functioning of every hardware equipment are driven by software. The combination of physical equipment (hardware) and logical instructions (software) gives modern computing systems their power and versatility.


  

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