Non-periodic structures are arrangements of atoms or molecules that do not repeat in a regular pattern. Unlike periodic structures, such as crystals, which have a consistent geometric arrangement, non-periodic structures can exhibit a more complex and varied organization. This can lead to unique properties and behaviors in materials. An example of a non-periodic structure is quasicrystals, which have an ordered arrangement but lack translational symmetry. These structures can be found in certain alloys and have applications in various fields, including materials science and nanotechnology. Their unusual properties make them a subject of ongoing research and interest.