Substances in what state can easily change their shape and volume?

A substance that is in a gaseous state tends to occupy the entire provided volume and shape. This is due to the absence or weak interaction between gas molecules. Molecules move freely, chaotically and occupy the entire volume and shape.
In a liquid state, a substance retains its volume constant, only it can change the shape of this volume. The shape of the volume is limited by the shape of the vessel in which this liquid is located. An average interaction force arises between the molecules of the liquid, which does not allow the molecules to move chaotically, but makes it possible for them to move relative to one another.
During compression, the distance between the structural units decreases, which in turn leads to the appearance of a repulsive force, which does not make it possible to compress the liquid.