Fourier Transform Infrared Spectroscopy (FTIR) has emerged as a powerful analytical technique widely used in various scientific disciplines, particularly in chemistry. FTIR spectrometers play a crucial role in the identification and characterization of materials based on their infrared absorption spectra. This article aims to delve into the principles, applications, and advancements of FTIR spectroscopy. FTIR spectroscopy relies on the interaction between infrared radiation and matter. When a sample is exposed to infrared light, its molecular vibrations absorb specific frequencies of the radiation, leading to characteristic absorption bands in the spectrum. Traditional dispersive spectrometers, such as those using prisms or gratings, have been largely replaced by FTIR spectrometers due to their superior speed and sensitivity. FTIR is extensively used for qualitative and quantitative analysis of organic and inorganic compounds. It is particularly valuable in identifying functional groups within molecules. FTIR spectrometers continue to be indispensable tools in analytical chemistry, providing valuable insights into the composition and structure of diverse materials. With ongoing advancements, FTIR spectroscopy remains at the forefront of scientific research and technological innovation, contributing to breakthroughs in various fields.