First announced at E3 in June, Microsoft is currently shipping the Xbox Wireless Adapter for Windows to most of its markets. In the US, the price for the adapter is $24.99. It allows people to play Windows 10 PC games wirelessly with Microsoft's current Xbox One controller.
"With the Xbox Wireless Adapter for Windows, you'll simply plug the Adapter into the USB 2.0 or 3.0 port of your Windows 10 PC laptop or tablet and bind the Adapter to your Wireless Controller to enable the same gaming experience you're used to on Xbox One, including in-game chat and high-quality stereo audio. The Xbox Wireless Adapter for Windows accommodates up to eight controllers per unit, and up to four chat headsets or two stereo headsets."
Keep in mind that this adapter is just for PCs that have Windows 10 installed; it will not work with your Xbox One controller if you have any older versions of Windows on your PC.