With the aid of a diagram differentiate between tower and desktop types of system unit

The main difference between a tower and desktop system unit lies in their physical form factor and size.

1. Tower system unit:
- A tower system unit is a type of computer case that is tall and narrow in shape, resembling a tower.
- It is usually placed on the floor or a desk adjacent to the monitor.
- The tower case is designed to have more vertical room, allowing for expansion cards, additional hard drives, and cooling systems.
- It typically has a larger capacity for storage drives and expansion slots to accommodate various hardware components.
- The power supply unit is integrated within the case.
- Towers are commonly preferred in gaming setups or for users who require high-performance and customizable hardware configurations.

2. Desktop system unit:
- A desktop system unit is a horizontally-oriented computer case that sits flat on a desk.
- It is compact and takes up less space compared to the tower case.
- The desktop case usually has limited expansion slots and fewer drive bays to accommodate additional hardware.
- Due to its smaller form factor, desktop units may have limitations in terms of the power supply unit and cooling options.
- The power supply unit is usually placed externally or within a small enclosure.
- Desktop units are commonly preferred for basic computing tasks, offices, or home use.

Diagram:

```
____________________________ ___________________________
| | | |
| | | |
| Tower Case | | Desktop Case |
| | | |
| | | ___________________ |
|____________________________| | | | |
| | | |
| | | |
| | | |
| | | |
| |___________________| |
| |
|___________________________|
```

Overall, towers provide more flexibility for expansion and customization, while desktops offer a more compact and space-saving design. The choice between the two depends on the user's specific needs, available space, and desired level of hardware customization.