A computer is an electronic device that can accept data as input, manipulate it, produce a result, and store that result. There are several types of computers including super computers, mainframe computers, mini computers, and micro computers. Super computers are the fastest calculating devices and can perform hundreds of millions of instructions per second, being used by government agencies for advanced processing needs.

3. Computer is:
• An electronic device
• Accept data
• Manipulate data
• Produce result
• Store result

4. Super Computers
 Mainframe Computers
Mini Computers
Micro Computers

5.  Fast computers
 Perfome hundreds of millions instructions
per second
 Fastest calculating device
 Used by government agencies
Example:
IBM’s Roadrunner

7.  An industry term
 Process data at very high speed
 Main computer built into a frame
 Quite expensive
 Normally used in
 Banking
 Airlines
 Railways

9.  Introduced in the 1960’s
 Less capacity to store data
 Low cost and small
 Lower in speed than mainframe computers
 Larger and faster than micro computers

11.  Used commonly because of their size and
cost
 Microprocessor gave birth to
microcomputers
 Much cheaper

13. Basic needs of modern life
Necessary to know its functions and
history
Used in different eras
Used with different and complex
techniques.