The molecules of a solid are close together and contain the least amount of kinetic energy. A solid is characterized by resistance to a force applied to the surface.
A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a constant volume independent of pressure.
I am a state of matter that has neither a fixed shape nor a fixed volume. There is a lot of empty space between the particles, which have a lot of kinetic energy and are not particularly attracted to each other.