What is the hook at the back of a car?

[EmilianoMarie]

This is called a tow hook or trailer hitch, mainly used for towing trailers or RVs. In China, this hitch isn't very practical since ordinary people rarely have the need to tow RVs or jet skis for travel. Many people install it just for aesthetics, while others use it as a rear-end collision deterrent—though this may protect your car at the expense of the one behind you. Tow hooks are more useful abroad, where holidays are frequent, and average families often tow RVs or travel trailers. Even without RVs, station wagons are common, making hitches more prevalent overseas.