Plasma is actually the most common state of matter on a galactic scale. It is present on the surface of the sun, in electrical sparks including lightning, and in a fire that is sufficiently hot.
Often times states of matter are not super well defined and its better to describe by the forces that dominate their behavior. Solids have strong internal forces and will hold their shape and volume unless another solid interacts with them. Liquids can flow past themselves and will take the shape of a container but the internal forces maintain a set volume. In gases there is enough energy that the internal forces cannot maintain a set shape or volume. Plasmas contain free roaming electron which means their behavior is more heavily influenced by external electromagnetic fields as opposed to internal electromagnetic forces.
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