How common is plasma?

Plasma is by far the most common form of matter. Plasma in the stars and in the tenuous space between them makes up over 99% of the visible universe and perhaps most of that which is not visible. On earth we live upon an island of "ordinary" matter.

Although naturally occurring plasma is rare on Earth (e. g. a lightning strike), there are many man-made examples. Plasma glows when it conducts electricity in neon signs and fluorescent bulbs.

my source: google