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What is a Computer?

What is a Computer?

Think of a computer as a helpful robot. It can't think for itself, but it's amazing at following instructions. You give it a task, it works on it super fast, and then it shows you the result. Whether you're playing a game, watching a video, or writing a story, a computer is there to help you get it done.

Lesson image

Every single thing a computer does can be broken down into three simple steps: input, processing, and output. Let's see what that means.

The Three Big Steps

Imagine you're drawing a picture. First, you pick up a crayon and decide what to draw. That's your idea, or input.

Next, you think about how to draw it and move your hand to make the shapes on the paper. Your brain and hand are working together. That's the processing.

Finally, you have a finished drawing on the paper! That's the output.

Computers work in the exact same way. They take in information (input), do something with it (processing), and give back a result (output).

This cycle is happening all the time when you use a computer. When you type a letter, click a mouse, or talk to a virtual assistant, you're giving the computer an input. The computer processes your command and produces an output, like showing the letter on the screen, opening a program, or answering your question.

Giving Instructions and Getting Results

The tools we use to give the computer information are called input devices. They let us put data into the computer. A keyboard is an input device because you use it to type letters and numbers. A mouse is another input device you use to click and move things around.

The parts that show us the computer's results are called output devices. They let us get information out of the computer. A monitor or screen is an output device because it displays pictures and words. Speakers are output devices because they play sounds.

Input Devices (Giving Instructions)Output Devices (Getting Results)
KeyboardMonitor
MouseSpeakers
MicrophonePrinter
WebcamHeadphones

At its core, a computer takes information (called input), works with it (processing), and shows us the result (output).

Now that you know the basics, let's see how much you've learned.

Quiz Questions 1/5

What are the three fundamental steps a computer follows for every task?

Quiz Questions 2/5

Which of the following is an example of an INPUT device?

Understanding input, processing, and output is the first step to seeing how these amazing machines work.