Difference between SPRINGS and COILOVERS? Can they cause damage?

mostly older cars and trucks would have a separate coil spring and a separate shock.Some of the newer stuff has a coil spring wrapped around a shock. This simplifies the design , saves weight, and cost a lot more to repair, and is less durable, and mostly found on light small cars. Older cars and trucks may have a progressive rate coil spring in front with a shock and a leaf spring on the rear or may have a coil spring on all fours, or even leaf springs on all fours. It depends on the manufacturer and what they want. coilover shocks and coil springs, need to be handled carefully when installing, the must be compressed to fit them in, and there is a lot of power in a spring under compression.