A computer is an electronic machine that receives data and instructions as input, processes the data according to the instructions, and produces meaningful information as output. A computer works based on the principles of input, process, and output - it receives input, processes it, and provides output. Input involves entering data into the computer, processing refers to the computer manipulating the data based on given instructions, and output is the meaningful information produced as a result.

1. Online class
Class 4
Prepared by:
Jeevan Subedi

2. A computer
• The term ‘Computer’ is derived from the Latin word
“COMPUTARE”, which means, “to calculate”. The
name ‘Computer’ was originally given to the people
who had to do lots of calculations. The manually
calculating job was very difficult and boring.
Therefore, scientists always wanted to develop a
machine that could perform calculations accurately
and very fast. As a result of such thinking scientists
developed a machine called ABACUS.

3. • A computer is an electronic machine that receives data and
instruction as an input, processes the data according to the
instructions, and produces meaningful information as a result.

5. How does a computer work?
• A computer can perform several tasks. But a computer cannot
perform the tasks itself. You have to tell the computer what to
do by giving instructions.
• A computer works on the basis of Input, Process and Output
principle.
• Input Processing Output

6. What is Input- Process and Output?
• Input: ………………………………………
• Process: ……………………………………………
• Output: ……………………………….