🧠 **Main Hardware Components and CPU**

In this lesson, we will explore the **key hardware components** of a computer system and learn about the **structure and function of the CPU** (Central Processing Unit).

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## 🧩 Main Hardware Components

A complete computer system includes:

1. **Input Devices** – Used to enter data into the computer
2. **Output Devices** – Used to show results or information
3. **Main Memory** – Temporary memory (RAM & ROM)
4. **Secondary Storage** – Long-term storage (e.g., Hard Drives)
5. **CPU (Central Processing Unit)** – The brain of the computer

These components work together to process and output data.

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## 🔧 Central Processing Unit (CPU)

**Definition:**
The CPU is the hardware that processes instructions entered into the computer to produce output.

It is responsible for:
– Executing instructions from hardware and software
– Controlling the flow of data
– Performing calculations and making decisions

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## ⚙️ Parts of the CPU

The CPU contains two key parts:

1. **Control Unit (CU)**
– Manages the operations of the CPU
– Coordinates activities of input, output, and memory

2. **Arithmetic Logic Unit (ALU)**
– Performs all arithmetic calculations (e.g., +, –, ×, ÷)
– Performs logical operations (e.g., comparisons like >, <, =)

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### 📌 Summary:

| Component | Description |
|———–|————-|
| Control Unit (CU) | Controls data movement and coordinates tasks |
| ALU | Handles math and logic tasks |
| CPU | Executes instructions and processes data |

Every program you run and every button you click depends on the CPU!

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📝 In the next lessons, we will explore **RAM, ROM, and memory types** in detail.