🧠The Brain That Follows Instructions

So far, we’ve learned how computers use switches, wires, memory, and bits.

But who’s in charge of all of it?
Who says:

“Add these two numbers. Now show this word. Now open that game.”

That boss is the CPU or the Central Processing Unit — though we won’t call it that just yet.

Let’s call it:
👉 The Brain of the Computer

 

🧠 This Brain Doesn’t Think — It Follows

Unlike your brain, this one doesn’t make guesses.
It doesn’t feel or daydream.

It just:

  1. Reads instructions

  2. Does exactly what it’s told

  3. Then moves to the next one

  4. Again. And again. And again.

And it does this billions of times every second.

 

📜 What Are Instructions?

An instruction is just a tiny command:

  • Add these two numbers

  • Show this letter on the screen

  • Save this file

  • Move this image 1 step to the right

Each instruction is made of bits, just like everything else.

The Brain reads these bit-patterns and says,

“Ah, okay. Do this. Next!”

 

📦 It Needs a Recipe

The Brain needs steps — in the right order.

That’s what a program is.
Just a long list of instructions written in computer language.

Like:

  • Step 1: Add

  • Step 2: Store

  • Step 3: Show

  • Step 4: Repeat

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