Lesson 1 of 5 · ⏱ 8 min

What Is a Computer?

Meet the machine you’ll command to build games — and the one rule it never breaks.

A computer looks complicated, but at heart it is something simple: a very fast, very obedient helper that follows instructions. It cannot get bored, it never gets tired, and it will do exactly what you tell it — millions of times a second. The catch? It does exactly what you say, even when you make a mistake. Learning to give clear instructions is the whole game. Literally.

The four jobs every computer does

Whether it’s a phone, a laptop, or a giant gaming PC, every computer does the same four things, over and over:

1. Input — it takes in information (you press a key, tap the screen, move the mouse). 2. Process — the brain of the computer, the CPU, works out what to do. 3. Output — it shows a result (a picture on screen, a sound). 4. Storage — it remembers things for later (your saved game, your high score).

A game is just these four jobs happening incredibly fast: you press → (input), the computer moves your character (process), draws the new frame (output), and remembers your score (storage) — about 60 times every second.

Hardware vs software

People mix these up, so let’s make it stick. Hardware is the parts you can touch — the screen, the keyboard, the chips inside. Software is the instructions — the programs that tell the hardware what to do. A game is software. When you build a game, you’re writing software that runs on someone’s hardware.

Your first instruction to the computer

Enough theory — let’s give the computer an instruction and watch it obey. The little window below is a real, working coding lab. Press ▶ Run and the computer will draw a message on the screen, exactly as the code tells it to.