Crystal structure is a branch of science that focuses on the arrangement and organization of atoms in crystalline solids. It studies the repeating patterns and shapes that atoms form within a crystal lattice, which ultimately determine the physical and chemical properties of the material. Techniques such as X-ray crystallography, electron microscopy, and neutron diffraction are commonly used to study and determine the crystal structure of a material. Understanding crystal structure is important for various fields such as materials science, chemistry, physics, and geology, as it helps in predicting the behavior and properties of different materials.