A domain wall is a codimension-one configuration interpolating between disconnected components of a vacuum manifold. In a one-dimensional system with broken discrete symmetry it is a point defect of finite energy, so positional entropy produces a nonzero density at every positive temperature.
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A domain wall refers to a boundary between two regions, or "domains," in a material where the direction of magnetization, polarization, or some other order parameter changes. Domain walls are particularly significant in the fields of magnetism and ferroelectricity. ### In Ferromagnetic Materials: In ferromagnetic materials, magnetization vectors can point in different directions within distinct regions (domains).