What is plasma?

In physics and chemistry,plasma is a substance similar to gas in wish  a certain portion of the particles are ionized.The presence of a non-negligible number of charge carries make the plasma electrically conductive so that it  responds strongly to electromagnetic fields.Plasma,therefore,has properties quite unlike those of solids,liquids or gases and is consedered to be a distinct state of matter.Like gas,plasma does not have a definite shape or a definite volume unless enclosed in a container;unlike gas,in the influence of a magnetic field,it may form structures such as filaments,beams and double layers.Some common plasmas are stars and neon signs.