o  How does a computer work
The physical components from with a computer are constructed 
(electronic circuits and input/output devices)
             are known as “HARDWARE”.Most computers have four types of hardware component: CPUs, input, output and memory /storage. The CPU(central processing unit)executes programs(“SOFTWARE”)which tell the computer what to do. Input and output (I/O)devices allow the  computer to communicate with the user and the outside world .there are several kinds of memory/storage-fast,expensive,short-term memory (e.g.RAM) to hold intermediate result ,and slower,long-term memory/storage(e.g.magnetic disk and magnetic tape)to hold programs and data between jobs.

                    The command line is the shared ground between human and machine. When we type in an instruction, in- code, and there are different languages that the computer understands, we get a reply. There is also a different way of communicating with the computer. Instead of the command line, one can use a graphical user interface (GU I), the point and click cascading window layers system.

                    The noun”program” describes a single, complete and more-or-less self- contained list of instructions, often stored in a single file, whereas “code” and “software” are uncountable nouns describing some number of instructions which may constitute one or more programmes or part thereof. most programs, however, reply heavily on various kinds of operating system software for their execution. More on all this fascinating matter of fact and opinion in the next topics.
A computer system is made up of a number of different
 subcomponent systems which together allow the
A system to perform calculations and complicated tasks.
A computer system could run payrolls, control an
The engine in a car, fly an airplane or allow
a user to playgames and balance their checkbook.
Computer systems do vary, in size, cost and power,
 depending upon the task the that they are
 requiredTo perform. In this course, we are primarily 
concerned about personal computer systems, suitable For a small
business or home use.The diagram below shows a typical personal

 computer system.

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