What component do you need to have to build a PC?
You will need at least the following components to build a PC:

* Motherboard
* Processor (CPU)
* Storage (hard drive or SSD)
* Memory (RAM)
* Case
* CPU Fans/Cooling Unit
* Power supply
* GPU (Optionally)
Instruction: What component do you need to have to build a PC?
Context: 
Response: You will need at least the following components to build a PC:

* Motherboard
* Processor (CPU)
* Storage (hard drive or SSD)
* Memory (RAM)
* Case
* CPU Fans/Cooling Unit
* Power supply
* GPU (Optionally)