The many parts of the suspension (control arms, shocks, springs, etc) are the only thing suspending the rest of the car (chassis, frame, etc) from the road. Without it, the bumps would be extremely hard, and eventually damage the car and maybe the people inside.
Too soft of suspension, and it’d be an uncontrollable water bed floating down the road. An important part of the suspension is to keep the tires in contact with the road, while keeping the car easy and predictable to control.
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