How do liquid crystals behave differently from ordinary liquids and crystals?

In materials science, liquid crystals are considered an intermediate state of matter that bridges the gap between the properties of ordinary liquids and crystalline solids.12

Unlike ordinary liquids, which are isotropic and lack long-range order, liquid crystals possess specific symmetries inherited from crystalline solids. While they share the ability to flow like liquids, their constituent molecules—typically elongated and rod-shaped—exhibit a degree of orientational or positional order.132

Compared to crystals, liquid crystals are less ordered. In a standard crystal, molecules are locked into a rigid, repeating lattice with both translational and rotational symmetry. In contrast, liquid crystals maintain some mobility; for example, in the nematic phase, molecules are disordered in position but align their long axes along a common direction called a director. In the smectic phase, molecules may form layers, yet they retain the ability to move within those layers. This unique combination of fluidity and structural order allows liquid crystals to exhibit anisotropy, leading to distinct optical properties not found in ordinary liquids.123