what is computer

What is a  Computer?
* A  computer  is  an electronic  device  that manipulates information,  or  data. It  has the ability to  store,  retrieve, and  process  data.

People  use  computers  to make  their  work/  jobs easier.
1. Communication
2. Education
3. Business  purposes
4. Entertainment
5. Travel

Advantages
---------------------
Easy
Reliable
Effective  
Accurate
Time  saving
Money  saving
Connectivity
More??

Evolution  of the Computer

1st  Generation
* Around1940-1956
*Relied on  Vacuum Tubes

2nd  Generation
*Around1956-1963
*Used  Transistors

3rd  Generation
*Around1964-1971
*Used  Integrated Circuits  

4th  Generation
* 1971-present
*Uses  Microprocessors

5th  Generation
Artificial intelligent

Classification  of Computers

Computers  can be classified according to  
Size
Technology
Speed
Capacity,  etc.

Classification  According  to  Size
1. Personal/  Micro Computers Desktop  Computers Workstations
Notebooks  and  Handheld  Computers
Smart  Phones
2. Mini Computers
3. Mainframe  Computers
4. Super  Computers

Classification  According  to  Technology
1. Analog  Computers
2. Digital Computers
3. Hybrid Computers

Computer  Brands
acer
hp
dell
Lenovo
dosiba
ibm