The tyres are the most active safety equipment of your vehicle, especially in snow and icy conditions. Countless drivers believe AWD/4WD cancels the need for winter tyres. AWD/4WD helps the vehicle accelerate on snow and ice, but when it comes to stopping or turning it is the tyres that make the difference, not the drivetrain.
Your vehicle is kept on the road by the four tyre contact areas that are not much bigger than the size of your palm. All steering, braking and accelerating forces between a vehicle and the road are mediated by the tyres.
The owners manual of your vehicle will detail the winter tyre options and recommendations for driving in winter conditions. It will also list which wheel and tyre combinations are approved for fitting snow chains.