A sway bar is a metal bar attached to the rear of the chassis above the right and left suspensions. Your suspension springs currently have a rate of compression and when one spring is compressed the other tends to go unaffected. Suspension coupled with a sway bar increases the spring rate on the spring receiving the most pressure. Essentially, since the sway bar is attached to both right and left sides, when one spring has pressure the sway bar also puts pressure on the opposite spring. This is increasing your spring rate by forcing them to react to one another.
Since the springs now directly affect one another, lean is limited. Without a sway bar, when you are turning the inside springs compress while the outside decompress and in some instances lift the tire off of the road. The sway bar helps distribute the compression to the opposite spring, keeping the chassis more level to the ground, the outside tire should not lift off the ground in a corner with a sway bar. The sway bar is connecting both rear suspension springs and forcing the springs to work together.
Camber is the angle of the tire relative to the chassis. The tires have a direct relationship with the suspension and the sway bar creates a direct relationship with both tires and suspension springs. Without a sway bar, it is possible, during a turn, for the camber of the tire to be so drastic that you will be driving on the wall of the tire. The sway bar more evenly distributes compression, which limits lean, and therefore keeps the camber of the tires from becoming too positive. Positive camber can result in driving on the tires sidewall.
