Fourier Transform Spectroscopy (FTS) is a technique used in spectroscopy to obtain high resolution spectra. It involves measuring a signal in the time domain, converting it to the frequency domain using Fourier Transform, and then further analyzing the transformed data. FTS is a specialized skill that requires knowledge of optics, physics, and computer programming, as well as experience in handling complex instruments and analyzing data. It is commonly used in areas such as astronomy, atmospheric studies, and materials science.