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Plasma is the fourth state of matter.

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Plasma is the fourth state of matter. The fourth is plasma. To put it very simply, a plasma is an ionized gas, a gas into which sufficient energy is provided to free electrons from atoms or molecules and to allow both species, ions and electrons, to coexist

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When a certian gas is heated to a temperatue higher than the normal point, it ionizes and the charges freely move around as a group or collection of charged particles. This collection of charged particles is called as Plasma State.

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Plasma is not liquid.

Plasma is not solid.

Plasma is not gas.

But Plasma is an ionized gas in which ions and electrons coexist.

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Plasma is considered as the fourth state of matter. Plasma is a type of gas which consists of ionized atoms i.e., free positively charged (ions) and negatively charged (electrons) particles. Due to the free charged particles, this fourth state of matter exhibits unique property of conducting electricity. In simple words, the Plasma is the type of gas through which an electric discharge takes place.

Aurora Australis and Aurora Borealis commonly known as Northern lights, stars in the universe, lighting in Earth's atmosphere, etc. are some examples of Plasma.

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Plasma is an electrically neutral medium of unbound positive and negative particles (i.e. the overall charge of a plasma is roughly zero). Although these particles are unbound, they are not ‘free’ in the sense of not experiencing forces. Moving charged particles generate an electric current within a magnetic field, and any movement of a charged plasma particle affects and is affected by the fields created by the other charges. In turn this governs collective behavior with many degrees of variation.Three factors define a plasma  The plasma approximation: The plasma approximation applies when the plasma parameter, Λ,[26] representing the number of charge carriers within a sphere (called the Debye sphere whose radius is the Debye screening length) surrounding a given charged particle, is sufficiently high as to shield the electrostatic influence of the particle outside of the sphere.[21][22] Bulk interactions: The Debye screening length (defined above) is short compared to the physical size of the plasma. This criterion means that interactions in the bulk of the plasma are more important than those at its edges, where boundary effects may take place. When this criterion is satisfied, the plasma is quasineutral.[27] Plasma frequency: The electron plasma frequency (measuring plasma oscillations of the electrons) is large compared to the electron-neutral collision frequency (measuring frequency of collisions between electrons and neutral particles). When this condition is valid, electrostatic interactions dominate over the processes of ordinary gas kinetics.

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Solution: Plasma is the fourth state of matter. Technically, it is an ionized gas, a gas into which sufficient energy is provided to strip away electrons from their atoms or molecules and to allow both species i.e. ions and electrons, to coexist. When this happens, the plasma no longer acts like a gas. This "charged particle soup" now has electrical properties, and creates a magnetic field (because of the electrical field). The excited charged particles radiate light and other forms of electromagnetic radiation. Interestingly, it is the most common form of matter in the Universe and we can see the energy (light) given off by a plasma.

For instance,

We can make it happen on Earth in neon lamps and other devices by using electrical energy.

A hot gas passing through a big spark will turn the gas stream into a plasma that can be useful. Plasma torches like that are used in industry to cut metals.

The biggest chunk of plasma found in our Universe is the Sun and other big & small stars. The Sun's enormous heat rips electrons off the Hydrogen & Helium molecules that make up the sun.