An input into a computer is something as simple as your movement of the mouse or pressing some keys on a keyboard. Input is everywhere around us, it varies from anywhere between sensors in a washing machine to changing the temperature dial. Input is basically you doing something.
Output
Output is basically the system's response to your input. This can be you moving the mouse and the cursor moving on the monitor.
Specialist Needs
It is for example a brailic keyboard, or basically something that is specifically made for a certain purpose. Its need is to help people that cannot control things otherwise. Like Stephen Hawking's brain controlled wheelchair.
A good start Louie but it is all a little brief. Please take some time to add to these topics with more detail and include videos/animations/articles from websites that you have found that help support your understanding and knowledge.
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