The compression helical spring is made of coils. When this spring is compressed by some force, the space between the coils decreases, making the spring shorter.

We can see the application of a compression helical spring by looking at a hole punch.

The helical spring is the most used in mechanics. It is generally made of steel wound into a cylindrical or conical helix. Helical springs can work by compression, by tension, or by torsion.