Solid-state chemistry, frequently referred to as materials chemistry, is the specialized branch of chemical science focused on the synthesis, crystal structure, thermodynamic characterization, and physical properties of solid-phase materials. Rather than studying molecules dissolved in liquid solutions or reacting in gaseous phases, solid-state chemistry investigates inorganic compounds, extended lattices, ceramics, intercalation structures, and solid electrolytes at the atomic scale. Practitioners utilize high-temperature ceramic methods, molten-flux synthesis, vapour deposition techniques, and advanced powder X-ray diffraction to engineer novel materials with tailored electrical, magnetic, optical, and catalytic properties.