Question

why is computer called a system?

Answer 1

Here is your answer........
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Answer 2

computer is  called a system because it consist of many parts that forms into a system 

CPU - it process the data . it is also called the brain of computer 

Monitor - it is the digital screen in which you can see any output 

Mouse / keyboard - these are input devices uses for giving command , made CPU to act upon it .

And after completing the circuit it will called a system