Plasma is one of the four fundamental states of matter, alongside solid, liquid, and gas. It consists of ionized gas, meaning that some of its atoms have lost or gained electrons, resulting in charged particles. This state of matter is found in stars, including our Sun, where extreme heat causes gases to become plasma. Plasma is also present in everyday life, such as in neon signs and fluorescent lights. These lights work by passing electricity through a gas, which ionizes it and creates a glowing effect. Scientists study plasma for various applications, including nuclear fusion and advanced technologies.