Plasma is energetically the fourth state of matter, apart from solid, liquid, and gas states. Cold plasma discharges can be generated by stationary and pulsed (DC) and alternating (AC) electrical fields. It can be used to improve mechanical properties, adhesion and treatment. Nowadays, plasma technology has been used in many fields such as bio medic, automotive, printing and textile. In this brief review paper, cold plasma will be explained pertaining to how it works, the mathematical equations involved and its applications as produced by researchers.