Fourier Transform Infrared Spectroscopy (FTIR) is an analytical technique used to identify and study chemical compounds by measuring how they absorb infrared light. When infrared radiation passes through a sample, different molecular bonds absorb specific frequencies, producing a unique spectrum that acts like a “fingerprint” for the material. FTIR is widely used for both qualitative and quantitative analysis, helping scientists determine chemical composition, identify unknown substances, and monitor structural changes. It is commonly applied in pharmaceuticals, polymers, food, environmental testing, and forensic science. Because FTIR provides rapid, non-destructive, and highly specific results, it is one of the most reliable tools for characterizing organic and inorganic materials.