The original meaning behind the cards, first created 500 years ago, still remains elusive. But that didn't stop our reporter ...

Think those old SD cards are useless? Here's what you can do with them instead of throwing them out.

So, what do you do, then? Well, PCIe expansion cards can bring many modern features to your old PC, such as onboard Wi-Fi, advanced Ethernet, fast PD charging, and an abundance of USB and SATA ports.