Fourier Transform Infrared Spectroscopy, also known as FTIR, is a specialized analytical technique used to identify chemical functional groups present in a sample. It works by measuring the absorption or transmission of infrared light by the sample, which provides information about the types of chemical bonds present. FTIR spectroscopy is commonly used in fields such as chemistry, environmental science, and materials science to analyze various samples such as solids, liquids or gases. Proper training and expertise are required to perform and interpret FTIR data accurately.