A snow chain is a device made of metal links that is fitted around the tires of a vehicle to improve traction on snowy or icy roads. When driving in winter conditions, these chains help prevent slipping and sliding, allowing for safer travel. They are especially useful in areas where heavy snowfall is common. To install snow chains, drivers typically place them over the tires and secure them tightly. It is important to choose the right size for the vehicle's tires, as improper fitting can lead to damage. Many regions require snow chains during winter months, especially in mountainous areas like the Rocky Mountains.