QOTD: What's the Most Influential Hardware?

If you've been computing for a decade or longer, you'll know that there have been many companies that have come and go.

However, just because a company doesn't exist anymore, doesn't mean the device or devices it made didn't make a permanent and big impact to how we use computers today and what we use them for. Many of the companies that helped change the landscape of computing still exist today.

Things like, the mice, the joystick. Yes of course, the 3D accelerator--and we all know what company really set things in motion in that space! If you can't come up with a device, that revolutionized the computer, maybe you can come up with a device that changed the way you use a computer. Today's QOTD comes from 3DTested reader xNEM3S1Sx.

The question of the day is: What is the most influential piece of hardware ever made?