Crystalline ceramics is a class of solid inorganic, non-metallic materials characterized by a highly ordered, crystalline atomic or molecular structure. As an academic concept and research field, it investigates the synthesis, processing, microstructural evolution, and the intrinsic relationship between the crystalline structure and the resulting physical, chemical, thermal, electrical, and mechanical properties of these materials. Research in this area is significant for developing materials with tailored performance for applications requiring high strength, hardness, thermal stability, and specific functional properties in demanding environments.