The Anti-Roll bar is the 'sway' bar. This connects the two sides of the suspension and as one side compresses and the other unloads the bar is forced into twisting, which it resists. Thus in roll (hence the English anti-roll bar) it resists that roll to keep the car flatter. However, by resisting that roll the rear axle wants to go straight on at bends so the tendency is to oversteer. This has to be compensated for by making the front want to do the same to balance it out, thus making the front stiffer in roll by increasing the AR bar is the usual option.
A coilover damper is a damper (or less accurately a shock absorber) that has a coil spring wound around it. Typically these are most common on the rear suspension of motorcycles.
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