system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what's the difference between 4-wheel drive and all-wheel drive?
gpt
Usually, but the use is subjective, 4WD is a driveline designed to work as 2wd, but can be put into 4wd in low traction situations. This usually means the front and rear drive are able to be locked, which causes binding in good traction, which is why it's not for use all the time. All-wheel-drive is a system that is meant to deliver at least some power to all 4 wheels, allows full differentiation in speed between all four wheels, and can be used in all conditions without unnecessary wear.