1. The Computer
System.

3. A computer is a device that accepts
input, processes data, stores data and
produces output.
Input Process Output
Storage

5. • Input is the process of entering data into
the computer.
• Getting data out of the computer is the job
of output devices.

6. Basic functions of a computer:
Input Entering of data into a computer
Processing Transform data into meaningful information
Output Getting processed data out of the computer
Storage Saving the data in the computer for later
use
Retrieval Data is fetched from the computer and read

7. Some Examples of An :
Input Devices Output Devices

8. • A computer can be divided into two main
categories: Hardware and Software.
• Hardware, are the physical units that make up a
computer system ,all those units that can be
seen or touched.
• Software, is another word for programs which
are still on the computer and cannot be touched.

9. There are two main types of software :
Software
System Software Application Software

10. • Application Software is the kind of software that people
use to perform a general-purpose task, such as word
processing software.
• System Software is the software that the computer uses
to manage its own internal activities and run application
software.
• The Operating System is the most important software,
because without it no computer hardware can function.

11. Example:
User Application System Hardware
Software Software

12. Input CPU
Output
-Keyboard 1 2 3 -Printer
Main
Memory
*1. Address Bus
Storage
2. Data Bus
-Hard disk
3. Control Bus

13. Main Components of a Computer
are :
• The Central Processing Unit (CPU) & the
main memory .
• The Backing Storage
• The 3 Buses
• ** A bus is a data roadway along which
data and commands to travel.