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In a gas atom like hydrogen, when the vibration increases the heat makes the atom expand more and lose its electron. The hydrogen atom becomes two separate charged particles: proton (+) and electron (−). Each of these particles is called plasma – a positive plasma and a negative plasma.
Plasma is not only produced by heat but also by particles bombarding the atoms. We can find plasma produced by heat in the sun, and plasma produced by particles bombarding the atoms in the ionosphere. We can also find artificial plasma during electric welding and inside fluorescent lamps.
Interstellar space, the stars, and most of the universe is plasma. our planet is a tiny mass in a sea of plasma.