Get started with Boot Camp
You can use Boot Camp Assistant to install Windows on your Mac.
To find out which versions of Windows your Mac supports, see the Apple Support article System requirements to install Windows on your Mac using Boot Camp.
Depending on the model of your Mac, you might need an external USB drive to install Windows (you’re asked for one when you prepare your Mac for Windows if it’s required). Newer Mac models—with OS X 10.11 or later—use the internal drive to temporarily store the items you need to install Windows and don’t require a USB drive. For more information, see the following articles:
Apple Support article: How to install Windows using Boot Camp
Apple Support article: Use Boot Camp Assistant to find out if your Mac requires Windows installation media