What is Plasma?
Plasma is known as the fourth state of matter, next to solid, liquid or gaseous. When adding energy to a gas, the electrons separate from the nucleus and move around freely. Plasma is thus a (partially) ionized gas, which shows, as an electroconductive gas, a variety of interesting attributes. 99% of all matter in the visible universe is in the state of plasma, which can amongst others be found in the sun or stars.
Next to this very hot plasma, a cold, low-pressure plasma can also be generated artificially. This kind of plasma is used in plasma medicine.