Both wifi and ethernet devices will need drivers, but Windows 10 generally includes drivers for most common devices. Because of this, it can connect to the internet and then download the drivers it needs for everything else. If you are unlucky and it doesn't include drivers for your device, you'll have to install them from a USB drive, CD, etc. before you can connect to the internet. This potentially problematic and frustrating catch 22 is precisely why they make an attempt to include them these days.