You're thinking about the four fundamental states of matter, not just three! Here's a breakdown:

* Solid: Has a definite shape and volume. Particles are closely packed and vibrate in place.

* Liquid: Has a definite volume but takes the shape of its container. Particles are closer than in a gas but can move around.

* Gas: Has no definite shape or volume. Particles are far apart and move freely.

* Plasma: Often called the "fourth state of matter". It's a superheated gas where electrons are stripped from atoms, creating a mix of ions and free electrons. It's found in stars, lightning, and fluorescent lights.

Let me know if you'd like to learn more about plasma!