Cold plasma is a state of ionized gas in which the energy of particles is kept at a low level, which allows it to be used in medicine and cosmetology without the risk of overheating or tissue injury. Hot plasma is a state of ionized gas in which the particles have high energy, resulting in an elevated temperature. Hot plasma is used in other areas such as nuclear physics or industry. The main difference lies in the energy level of plasma particles and temperature. Hot plasma has a very high temperature and high particle energy, which can be dangerous for use in cosmetology and medicine. At the same time, cold plasma has a low temperature and low particle energy, which allows it to be safely applied to the skin.