If i tell you that the electric fan in your room is a computer, you will debate it, though not everyone.

When we hear the word computer our attention moves to that device we use for surfing the internet, create documents or graphic designs etc.

What is a Computer: It is an electronic device that sends data through an input device (mouse, keyboard), processed the data through processing units (CPU), displays the processed data through an output device and stores the information for later retrieval as soft copy or hardcopy.

There are three types computer
Analog computer
Digital computer
Hybrid computer.

What Computer System: This is the combination of electro-mechanical devices (Monitor, Keyboard,mouse and system unit) to form one unit to perform tasks.

If you have any device that has the following Input device, Processing device and Output device that device is a COMPUTER, that mean your electric fan is a computer, though it falls under Analog computer while the computer system is an example of digital computer

did u write this ur self?

I can write more on this, with lots of example.
Check out my other posts