The state of matter that has a definite shape and volume is called a solid. In solids, the particles are closely packed together in a fixed arrangement, which gives them a defined shape. Unlike liquids and gases, solids do not conform to the shape of their container. The strong intermolecular forces between particles in solids keep them in place, allowing only slight vibrations. This structural rigidity is what distinguishes solids from other states of matter. Examples of solids include ice, wood, and metals, all of which maintain their shape unless acted upon by external forces.