What is Plasma in terms of a state of matter?
Simply plasma is like gases in the sense that they have no fixed shape or volume and are also less dense than solids or liquids, but plasma behaves in very different ways to gases. Plasma is a molecule where all electrons have been stripped which leaves the positively charged nuclei to roam freely.
(an ionized gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge, typically at low pressures (as in the upper atmosphere and in fluorescent lamps) or at very high temperatures (as in stars and nuclear fusion reactors). – Google Definition of what is Plasma
Where can plasma be found or used in modern day life?
The Sun (from Core to Corona)
Fluorescent Lights and Neon Signs
Nebulae (Luminous Clouds in Space)
The Solar Wind
Primordial Fusion during the evolution of the Universe
Magnetic Confinement Fusion Plasmas
Inertially Confined Fusion Plasmas
Flames as Plasmas
Auroras (Northern & Southern Lights)
Interstellar Space (It's not empty... It's a plasma)
Quasars, Radio galaxies, and Galaxies (Emit plasma radiation and microwaves)
Large Scale Structures of Galaxies (Filamentary and magnetized...!)...