Crystallographers are scientists who study the arrangement of atoms in crystalline solids. They use techniques like X-ray diffraction to analyze the structure of crystals, which helps them understand the properties of materials. This knowledge is essential in various fields, including chemistry, physics, and materials science. By examining how atoms are organized in a crystal, crystallographers can determine how substances behave and interact. Their work is crucial for developing new materials, pharmaceuticals, and technologies. Notable applications include the design of drugs and the creation of advanced materials for electronics and engineering.