Information is data processed for some purpose
Information can only be considered to be 'real' Info if it meets certain criteria i.e.
1. it must be communicated to the recipient
2. it must be in a language that is understood
3. it must be in a suitable form
4. it must be relevant for achieving some purpose
Information -
is any form of communication that provides understandable and useful knowledge for the person receiving it.
What Is A Computer?
1 A computer is a general purpose, programmable device that is used
for the production and processing of information.
2 capable of calculating and storing results
What do we mean by general purpose?
1. Most devices can be described by their function e.g Washing Machine, DVD Player
2. Computers, however, can be used for almost any purpose:
- typewriter
- video editor
- accounts tracker
- database / address book
- DVD / CD Player
- and many others…
Computers Are Programmable
1. Computers repond to instructions in the form of programs
2. Programs are written in order to make computers behave in specific ways i.e. word processor, systems control
3. Programs are stored in the Computer memory
How computers process information
- Computers accept inputs ( i.e. data)
- The input is translated into binary numbers and‘processed’
- The process produces output (i.e information)
- This sequence can repeat endlessly: outputs can be inputs!
- Illustrating this - the ‘Black Box’ model
We can think of a computer as a ‘black box’ :
input process output 3+5 8
Components of a Computer System
- Computer Systems are made up of:
- Hardware – the physical parts
- Software - the instructions or programs that control the hardware
- The Human Being – the brains behind the whole system!
- Mainframe Computer
- Minicomputer
- Personal Computer (Microcomputer / Desktop)
- Laptop
- Network Computer / Server
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