What is a computer ?



Computer is an electronics programmable device that receives input , stores data and provides output in a useful former . 





How to start a computer ? 

Board switch on -  UPS switch on - CPU switch on


What is  hardware ?

Touchable electronics component inside for a computer 

 Ram, hard disk, motherboard etc.


Input unit

Input unit device is switched as a device by which a user can dive into the instructions of the computer system like  motherboard, Mouse ,light print.


System unit and memory:- 

Memory is the port of the computer system, which can Store the data. It is divided into two categories -

Primary memory -. 

 Ram Rom is an example of primary memory which is directly accessed by the process. It can store less amount of data compared to secondary memory. A primary memory is used for storing the data temporarily .

Secondary memory 

The secondary memory cannot be accessed directly by the processor, it can be used to store the data permanently.


Hard dick, CD, DVD, are the explain of secondary memory.






কম্পিউটার ভাইরাস নাম 

Name of computer virus 

Jerusalem - 1987

Morris - 1988

Solar Sunrise -1988

Melissa - 1999

Monmouth - int