Fourier Transform Spectroscopy (FTS) is a technique used to analyze the spectral content of light. It works by measuring the intensity of light as a function of time, rather than wavelength. This time-domain data is then transformed into a frequency-domain spectrum using the Fourier Transform, a mathematical process that converts signals between time and frequency domains. FTS is widely used in various fields, including chemistry, physics, and astronomy, to identify materials and study their properties. It offers high resolution and sensitivity, making it effective for detecting subtle changes in spectra, which can reveal important information about molecular structures and interactions.