What is the chemical nature that makes up medication capsules?

Medication capsules is a cylindrical shape with two halves which often can be pulled apart from each other.
The capsule holds powder or grains which is the "medication". Also exist spherical or ovoidal Buy S Capsules containing a liquid. Most med capsules are made up of Gelatin. Other vegetable capsules are made from hypromellose, which is made from cellulose.