Coilovers are a type of suspension system used in vehicles that combine a coil spring and a shock absorber into a single unit. They allow for adjustable ride height and damping, enabling drivers to customize their vehicle's handling and comfort. This makes them popular among car enthusiasts and those looking to improve their vehicle's performance. Installing coilovers can enhance a car's stability and cornering ability, especially during high-speed driving or racing. They are available for various vehicle makes and models, providing options for both street and track use. Proper installation and adjustment are crucial for optimal performance and safety.