What are graphics cards, and why do you want one?

Graphics cards! So hot right now. Whether it's the slow realization that jumping on board with the 2016 VR revolution requires a tricked-out gaming rig you'd never previously have dreamed of stashing under your desk, or the blitz of hype surrounding Nvidia's latest 1000-series GPUs, there's more reason to get excited about PC gaming hardware than there has been in years. But what is a graphics card? Do you really need one, and which one do you need?
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