Coil springs are also often featured in solid-axle systems, such as a 4-link, which is superior to keeping a the axle in place and eliminating issues unique to leaf springs, ...

Or a coil spring is nothing more than a coiled-up torsion bar. Take your pick, both statements are correct.” The way a torsion bar works is pretty simple, as it resists torsion or twisting.

Coil springs, which are basically just steel loops wrapped around a strut, pretty much eliminate any frictional issues, meaning they start absorbing the bump right away.