Crystal packing is a research area within the field of solid-state chemistry and crystallography that focuses on studying the arrangement of molecules within a crystal lattice. The goal of crystal packing studies is to understand how molecules interact with each other in the solid state, how they are arranged in a crystal lattice, and how these arrangements affect the physical and chemical properties of the crystal. This research area often involves the use of X-ray crystallography to analyze the three-dimensional structure of crystals and determine the precise arrangement of atoms and molecules within the crystal lattice. By gaining insights into crystal packing, researchers can better predict and control the properties of materials, such as their conductivity, hardness, or optical properties.