Here's how all-wheel drive (AWD) or four-wheel drive (4WD) work, their pros and cons and when they're most useful. Many, or all, of the products featured on this page are from our advertising partners ...

What's the difference between AWD and 4WD? I was handed the keys to the brand new BMW M5, which can actually switch between 4WD and 2WD! Nothing all that impressive for any truck drivers out there, ...