The Four States of Matter

When I went to school, I was taught that there are only three states of matter. And so a solid is fixed in terms of volume and shape. Then you can move up with a bit of extra heat to the next state of matter from solid and get a liquid. It has the same volume, but now it can take the shape of the room. There are other states of matter like Bose-Einstein condensates or quark-gluon-plasma. But getting back to electricity, on one hand you can think of electricity as just being electrons moving in a wire,. That's kind of true, and that doesn't really fit into the solid-state liquid