Plasma, often referred to as the fourth state of matter, does not have a definite shape or volume. Unlike solids, which have a fixed shape and volume, and liquids, which have a definite volume but no fixed shape, plasma behaves more like a gas. It can expand to fill the container it is in and does not maintain a specific shape.
Plasma is composed of charged particles, including ions and free electrons, which are not bound together in a fixed structure. This allows plasma to be highly responsive to electromagnetic fields, making it capable of flowing and changing shape easily. The lack of a definite shape and volume is one of the key characteristics that distinguish plasma from the other states of matter.