Solid, liquid and gas are the three main states of matter. Plasma, the fourth state, is an ionized gas that forms when energy is applied to a gas. Plasma is very common in the universe but can also be created at lower temperatures suitable for medical use as "cold plasma". Cold plasma has potential applications such as promoting wound healing and sterilization. The document discusses a project testing cold plasma's efficacy on killing bacterial biofilms, which can cause infections. Preliminary results show over 90% of bacterial cells in biofilms were eliminated by cold plasma exposure. Current tests combine cold plasma with other antimicrobial agents to increase elimination and reduce treatment time.