springs are to lower your car, and yes it is part of the suspension, and generally with springs (depending on stiffness) will create a more bumpy feel, however with springs you will need new shocks n struts in the future...
The springs in your suspension hold up the weight of your vehicle and help resist pitch to the front and rear, and (in conjunction with the vehicles sway bars) resist lean to the side. Your shock absorbers are the primary suspension components that actually help "absorb shock" preventing continued bounce every time you accelerate, stop, corner or hit a bump. Shock absorbers are designed to slow and reduce these movements to help control the weight of the vehicle during transitions and allow your tires to perform better as they accept your input.
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