INTRODUCTION The use of computer and related devices in our daily activities today has become very frequent. Most people use computer without even realizing it’s a computer as most people limit a computer to just a desktop or laptop, whereas most devices today are work based on the algorithm and structure of a computer. In general computers are made to solve human problems as everyday human problems arise that needs urgent and immediate solution. Some computers are designed to handle and solve different kinds of problems while others are designed to solve only one problem. DEFINITION A concrete definition of computer that can cover all the types of computers may be rare to find as computers are evolving and invading different areas and aspects of life. There are different definitions used to describe or define a computer by different authors due to different conditions and criteria. For the purpose of this guide to practical computer, a computer could be defined as an electronic devi...