plasma is a state of matter similar to gas in which a certain portion of the particles are ionized. After sufficient heating a gas dissociates its molecular bonds, rendering it into constituent atoms. However, further heating may also lead to ionization (a loss or gain of electrons) of the molecules or atoms of the gas, thus turning it into a plasma, containing charged particles: positive ions and negative electrons

The plasma state is the fourth  state of matter and the most diffused in the  Universe. It is characterized by the absence of  molecular bond for biatomic gases such as  Nitrogen and Hydrogen and atomic bond for  mono atomic gases such as Argon and Helium. By  supplying  HEAT ENERGY to a biatomic gas,  its molecule breaks into atoms and atoms by further energy, break  into one or more positive charges.
Hence the plasma state is an ionized gas, formed  by positive ions and negative electrons of the  gas initially in neutral condition and is a very  good conductor of electricity and is affected by  magnetic fields.

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Plasma is so energetic or "hot" that in space it consists soley of ions and electrons. It is only when plasma is cooled that the atoms or molecules that are so predominant in forming gases, liquids, and solids that we are so accustomed to on Earth, is possible. So, in space, plasma remains electrically charged. Thus plasmas carry electric currents and are more influenced by electromagnetic forces than by gravitational forces. Outside the Earth's atmosphere, the dominant form of matter is plasma, and "empty" space has been found to be quite "alive" with a constant flow of plasma.