Here's why:

* Electrically charged particles: Plasma is composed of ions (atoms that have lost or gained electrons) and free electrons, making it electrically conductive.

* No definite shape or volume: Plasma takes the shape and volume of its container because the particles are not bound together in a fixed structure like solids or liquids.

Plasma is often called the "fourth state of matter" alongside solids, liquids, and gases. It's found in many natural phenomena, including lightning, the sun, and the aurora borealis.