Shock Absorber
They keep the tires from bouncing which causes loss of road contact and they also keep the vehicle body weight from shifting and rolling which causes a loss of vehicle control and handing. You could say then, that their main job is to resist both tire and vehicle body motion.
When shocks and struts are working well, the vehicle maintains traction on the road and has the optimum stability in every driving condition, stopping, turning, swerving over bumps and potholes.