Introduction

Introduction
Computer: Computer defined as an electronic device programmed to receive inputs conducted by processors (processing) to be converted into (outputs) , and then it out in the (Results) and in some cases stores (Store) if necessary.
Computer system which is the computer sanction of it consists of the following: -
1. kinds of programs, called (Software)
2.Data that process in the system (Data)
3. Evidence assistance and ways adopted in operating (Operating Manuals)
4. The person who uses the computer (User).
Chart (1.1) illustrates the components of the computer system

operations of computer
Operation of computer can be divided to:-
1. Input
We can input the data or the information through use the keyboard or take from the Hard Disk or from DVD,CD or Floppy.
2. Processing
Data is entered into the computer processing in the CPU (Central Processing Unit) that constitute the most important part of


computer distinguishes him from the speed and efficiency of achievement.
3. Output
After processing the data can be displayed on-screen (Monitors) or printed by printers or others.
4. Storing
After making processors for data entering the computer prefers storage results in hard drive Hard disk and this so-called Permanent balkhozn are either temporary storage in computer memory Random Asses Memory -RAM as data remains reserved as long as the device is working.
Storage capacity is measured in bytes which represent each byte value between the number (0-255)
The parts bytes are bit which represents the value (0) or (1) either kilobytes equal to (1024) bits.